All project as likely top of the rotation aces. If Darvish can come anywhere close to his stats from Japan, then he'll obviously win out, but it's unlikely that he'll come near those numbers (1.44 ERA, 0.83 WHIP, 10.7 K/9 in 2011)
Teheran dominated Triple-A last year at only 20 years old but his strikeout rate fell to under 8 K/9, which I find particularly troublesome. If you look at the top pitchers in baseball today, every one of them is an elite strikeout pitcher. If Teheran's getting under 8 K/9 in the minors, I could see him only getting like 7 K/9 in the majors. However, at 20 years old he still has room for improvement in this area.
Miller had a great 2011 across High-A and Double-A ball, putting up a 2.8 ERA and striking out 11 batters per 9 innings. The only complaint with him is that he needs to sharpen up his command. Miller's WHIP was 1.18 last year, which while solid, needs to improve for him to be the true ace he projects as.
So what do you all think? I'm leaning towards Miller - Teheran - Darvish in that order. Obviously if I were a major league team I'd be happy with any of them though. Please try to ignore Darvish's salary. Let's make this about talent only.