I cannot reccommend anything more highly than a Placette RVC linestage if you only have the single input device. It's right in your pricerange on the used market, and performance is superb! I can't say I know how well the two synergize, but based on the 23K input inpedence of the Pass you should be fine. I would do some research to check compatibillity to make sure before making a decision. I use a Placette with my Odyssey Stratos Dual Mono and the results are stellar. It does everything right and nothing to really fault at all. Soundstaging and mids are astoundingly good (I only mention those qualities since they are important to you, but it also does many other things right...I'll spare you the verbosity). It is definitely a very system-sensitive component. It does not work anywhere near as well in my SET system which has a 300K input inpedence. Your Pass system is much more similar to my SS system which is why I think it would work there. If you bought a turntable you would need a phono preamp as the RVC is only a linestage. The 3-input version is identical in performance, but has 3 input jacks and goes for around $900-1000 on the used market. Do more research - if it can work in your system I don't believe you will find anything better anywhere near the price, or for many times more for that matter.
Marco
Marco