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.
