Hope is it not too late.... I have a friend here with a great audi setup that includes your amps, he is having great results with a Pass X1 preamp. I know this is not what you are looking for (tube preamp) but I returned amazed of how good his system sounds with almost all sort of music genres.
(Parasound amps - Pass X1 preamp - Dynaudio spkrs - Avid Diva/clearaudio cart)
Fernando
(Parasound amps - Pass X1 preamp - Dynaudio spkrs - Avid Diva/clearaudio cart)
Fernando