Pass Labs X2.5 or Krell KAV-280p? WWYD?

I'm shopping the used preamp market, and see a few solid state units in my price range. Notably the Pass Labs X2.5 and the Krell KAV-280p. Within $500 of each other, both are very affordable.  And I need to say that borrowing one and listening to it in my system is not an option, I have to purchase on faith. So, I call on the vast experience of my fellow A'Goner's!  WWYD? (What would you do?)  

I have always been a solid state kind of guy, listen mostly to rock music, and my system consists of a Cary 306 CD player, VPI Scout w/Sumiko BPS III through a Phonomena phono pre, and Forte' Model 3 driving Legacy Focus 20/20 speakers in a 16x20 room. Most cables are Harmonic Technology Truthlink, with a Van Den Hul cable on phono and Legacy speaker cables. The amp is next on my list, so the Forte's days are numbered.  The preamp I'm replacing is a Parasound Halo 3. 

Has as anyone actually compared the two preamps? Or heard either one in a familiar system? I appreciate all opinions, advice, and testimonies.