Flipping The Closer -- Nathan

Is there a likely match that would make it worthwhile for the Twins to flip their closer?

This was brought up in the Twins GM thread but not adequately addressed.  Joe Nathan is an All-Star for the second year.  He makes $2.0 million this year, $3.75 in 2006, and $5.0 in 2007.  The Twins have a $6.0 million option in 2008.

Most of the damage to his peripheral numbers has been done in non-save situations.  The problem is: The Twins need more offense so they can have more save situations in the next 3.5 years.

With Guardado, Baez, and possibly Wagner on the market, is there a likely match before the trade deadline or in the off-season that would make it worthwhile for the Twins to flip their closer?  Or: What can the Twins get for an inexpensive All-Star closer?