$8000 budget on Pre-amp

I would suggest you take a look at the Herron VTSP-3AR02. I had several Audio Research (SP16 and LS26) and Modwright (LS36.5 and LS100) preamps prior to acquiring the Herron and the VTSP-3AR02 represented a significant step upwards from these well regarded models. My search for an extremely quiet, musically compelling preamp has ended with the Herron. I am not sure how it would mate with your Pass amplification but I believe I have seen this combination elsewhere. You could check with Keith on this as he is very honest and willing to talk through whatever questions you may have. The Herron is well within your price range.

The Shindo Auriges is a stunning preamp. It conveys the emotion of the music better then any pre I have ever heard. The VAC pre's are also very nice
Alan

Pass XP-20

I will "third" the VAC preamps. A used Renaissance Signature II would be worth waiting for. They are wonderfully musical, yet resolving, and can drive any amp load across long IC lengths, if need be. I have seen them sell here in the $8k or lower range as line stages.

Thank You all for your responses.
Here's where I'm at, I've demoed the BAT VK-33, Manley 300B, ARC LS27 and to date the BAT is hands down the best pre-amp of the bunch, way more inner detail and sound stage.
I'm having trouble finding a VAC, Shindo or Herron dealer near me(Chicago).