What tube pre-amps pair well with Pass amps?

I use my Pass XA-60.8 amps with an AR 5 preamp and YG Kipod speakers and the sound is exactly what I want.  My Digital gear is Esoteric N-01, K-01 and the Brinkman Nyquist II.  I am not a vinyl guy.

The Aric audio preamps seem to be built well with a good circuit design.Can they optimize it for the pass amps when you order one?

@invalid Thanks for the kind words! Offhand, there is no optimization or tweaks needed for any of my preamps to mate seemlessly with any of the Pass amps. I have dozens of happy customers currently using my line-stages with Pass amps without any issue with integration. Feel free to contact me via my website if you have any other specific questions! Best wishes, Aric

Wow!  Talk about a wealth of info!  While I'm still in my researching phase, I want everyone to know that I appreciate each of you for taking the time to share your experience and perspectives!

I have Pass Labs XA60.5 amps. My preamps are both Cary Audio - SLP-05 and SLP-98P F1 version. The modified SLP-98P sounds a tad better, so the SLP-05 is off to Cary for the Ultimate Upgrade. It should sound as good or better than the 98P when I get it back. The 05 has more features that I like - HT bypass, balanced operation, no phono.