If you like a dynamic, punchy sound (apparently this is krell's forte) then look at Cyrus (British). If you get a Cyrus integrated amp with the optional PSX power supply then this would probably give you enough power. I used to own a Cyrus 2 and PSX and I thought it was great ... it was just too much power for a small room. The newer Cyrus amps are very modular to allow for easy expansion to bi and tri amping.
You might also look for amps by Naim and Audiolab (8000S).
You might also look for amps by Naim and Audiolab (8000S).