What Amp to drive Apogee Centaur Majors?

The Centaurs line works very well with a 50 watt amplifier. That is the minimum power required. I prefer 60 to 100 watts. What amp would you mate with these speakers?
I'm using a Van Alstine tube preamp, Arcam DVD as a transport/Scott Nixon Tube Dac with 2 Adcom 535's. I have 1 Mk II an 1 original. The original has speaker A and B and that actually sounds good as they allow me to biamp at the moment sort of but it's a bit forward sounding. My modified Dynaco ST 70 does a great job in the midrange but the bass is not controlled as I like. So, I'm looking for suggestions of what amp some of you are using with your Centaur Majors. These are the 40" ribbon with 10" woofer. I also have 2 12" subs and they are acoustic suspension Dali 1.2s. Any input will be welcomed.