Man, that's an awesome system! The 20.1's are amazing speakers! As far as amps go the Jolida JD 3000's are the best amps I've ever heard with those speakers. It's as if they were designed for Magnepans! 200 watt monoblocks that use the 211 power tube that sounds very close 845 used in SET amps but with mega bass and slam! Plus the amps are cheap and take internal mods very well. Just a thought to check out some time.
Otherwise,
Enjoy!
vinyl9