Preamp recommedation

I've just picked up a Rotel RB-850 in a pawn shop. I want to use it to hook up to my PC via a USB soundcard. Looking for suggestions for a preamp to use. Nothing very fancy, just something that will do a competant job.

There is a used PS Audio 4.0 $165 sitting at Echo Audio ( 888 248 ECHO) in Portland, OR. I used to sell these and they are very detailed. Killer deal.