1.) Chad Billingsley - stud
2.) Yusmeiro Petit - Livan Hernandez type, favorable stadium
3.) Chuck James - #s are filthy. There are other top pitching prospects who have better combined stuff & perf that I would have to rate ahead of James. But not in this group IMHO.
3.) Rich Hill - is the curveball enough to succeed?
5.) Homer Bailey - don't like Reds track record developing pitching. But ceiling is high.

1.) Ian Stewart - Scouts love him. Coors!
2.) Lastings Milledge - I'm rating his as CF. If Beltran pushes him to RF value drops a little.
3.) Joel Guzman - rated as RF
4.) Felix Pie - needs to work on plate discipline
5.) Andy LaRoche - ditto. Big HR season inflated by Vero.
6.) Hunter Pence - I can't get worked up over a college guy dominating the low-A SALLY. Atleast not in this strong of a group.

Watch out for Pence.  I thinking he way overrated.  Was too old for the league he was in.

1. Stewart
   
2. Laroche (I am assuming you meant Andy)
   
3. Joel Guzman
   
4. Chad Billingsley
   
5. Lastings Milledge
   
6. Felix Pie

You have a very strong list. Keep in mind I have never played in a scoresheet league before and I am not familiar with their scoring system, but this is how i would rank them.

1. Yusmeiro Petit - only throws in the low 90's, but then again so does Pedro Martinez right now and it doesnt prevent him from miniscule ERA's.  Both guys are smart and wily pitchers with good secondary stuff and excellent control
2. Chad Billinglsey - Control isnt is good than Petit, but better scouting reports and is also a very smart and hard working pitcher.  Last year the only questions were about his control and his changeup and he improved on both in 2005.  Really close with Petit, probably interchangable at #1.
3. Chuck James - one of the top 3-5 lefties in the minors.  Numbers are insane, scouting reports less so, but you gotta trust the Braves on this one.  If they trade him his stock would drop a bit in my eyes.  The only reason he's behind Billingsley and Petit is age.
4. Rich Hill - old at 25, but more ready to contribute than the guys ahead.  I dont like the control problems.  If he could be a more consitent groundball pitcher i could see him as a solid 2-3 type starter, but for now he looks more like a backend of the rotation guy.
5. Homer Bailey - the benifit that James gets from being in the Braves organization works the opposite for Baily.  His ceiling might be as high as Billingsley's, but right now he gives up way too many walks, much more than Billingsley last year, and his hits/9 of 7.73 in low-A inst that great for a guy with supposedly great stuff.  Besides, how can you like a pitcher with the first name Homer.

1. Joel Guzman - even though he's probably capable, he'll never see much time at SS in the majors.  But his bat is enough.  His power is top of the line and he quietly improved his plate discipline improved this year, in particular he took more walks.  Im not as worried about the K's because of his size, athleticism, and power.  Compare him to the minor league careers of Richie Sexon or Derrek Lee, two tall righthanded hitters.  He has the best chance of hitting 40+ homeruns in the majors.  He has some risk, but considering he's the same age as Stewart, but has 168 games at AA and Stewart has yet to even see AA, I think he's moved to fast to quickly to be that much of a risk.
2. Lastings Milledge - He could easily be Carlos Beltran, or he could dissapoint us be just a really good leadoff hitter.  His performance is odd, sometimes he hits for power, sometimes he doesnt, sometimes he draws walks sometimes he doesnt.  But I think he might be one of the safest high-ceiling prospects in the game.  Milledge will probably have more defensive value than anyone on this list.
3. Ian Stewart - He can really hit, I think he might be able to start opening day for Colorado in 2007.  But the guy has yet to see AA, and the two environment he's been in have been easy environments for hitters, Ashville is the best hitters park in the SAL, kinda like Vero Beach in the FSL, and the California League might be the best hitters league in organized baseball.  I believe in him because he controls the strike-zone and he has real power.  He seems to be a good defender as well, his ceiling is as high at least as high as Milledge.
4. Andy LaRoche - Good defender, controls the strikezone better than people think.  He didnt draw many walks in Vero Beach but he didnt strikout much either and hit .333 with huge power.  His power and average dropped in AA, but he walked a lot more as well.  Scouts like his defensive tools, but it doesnt seem like he's really much of a defender yet.  His ceiling might not be as high as Stewert's, and he wont put up the numbers in Dodger Stadium that Stewert will in Colorado, but he's seen tougher environments and has hit in AA.  I think Stewert and LaRoche are really close and you could go either way and not be wrong, im just going with the younger guy.
5. Felix Pie - Hitting for power at his age in the Southern League is great, but it was only half a season and he doesnt draw as many walks as the other players on this list.  He's still far from the majors, needs to work on his baserunning, defense and control of the strikezone.  I think he's the highest bust candidate on this list, but might have as a high a ceiling as anyone else.  The reason I rank him 5th is because it doesnt seem that the Cubs emphasize plate discipline much, their other top prospects all stuggle in the k/bb ratio and look at Corey Patterson, Dusty Baker thought that he need to work with Shawon Dunston on his baserunning to turn himself into an effective player.  I just think there is too much chance that he follows in the path of Corey Patterson.

that said:

Billingsley
Hill
LaRoche
Stewart
Guzman
maybe Milledge or Petit

I like all those guys (some long term more than Hill or LaRoche), but if you have to give up actual MLBers to keep them, you probably aren't going to score wins.  Stewart, Guzman, Milledge prob won't play that much for 2 years, but with the ceiling and hype are worth keeping for trade if nothing else.  If you have a competitive team without Hill and maybe Laroche then move them/cut them and keep Milledge and maybe Petit. Alas, I had very high hopes for James, but without Mazzone I think I'd let others take the chance. The ceiling for Bailey, Pence and Pie is there, but time/gamble risk would make me shy away. Pie could be Vlad or Corey (who could very well end up Vlad...or Corey), what a variable.