Which Phono Preamp?

I would go with the pass phono to play with the pass integrated to mesh into your system better trying another phono stage might work to but staying with the same brand should sound the best.

If you are looking at a Colorado product, check out Ayre Px5e. Another great product is the Parasound HALO JC3+ Phono. Great reviews for both of these products. The Pass is good as well. I have the Ayre with the VPI Aries 3 100lbs unit that has all of the goodies. I use to have the Clearaudio Reference with a Tangent Arm and a Goldfinger Statement Cartridge. I used the Ayre with that as well. Hopefully you can tryout in your system. Let your ears do the telling.
Best of luck with your decision. 

zesto and passlab are versatile rock steady phonostages that we tried and very happy in high end setup. just a matter of taste and system integration really.