I have the Contour 3.0's up front and recently upgraded their amplification from the Krell KAV-500 (100w/ch @8ohm) to the Krell KAV-250a (250w/ch @8ohm). I personally love the Krell / Dynaudio combination, because the Dynaudio's love power and Krell loves to give it. I don't listen to music loud all that often (HT is another matter!), but I was amazed at how much cleaner / clearer everything sounded after changing the amplification, even at low volumes. Very noticeable and worthwhile. I have to assume that if cost is no issue, going with the Krell monoblocks would further the benefit, and I'm sure the 3.3's want at least as much power as the 3.0's do (though I know they're rated more sensitive). You can get a KAV-250a for around $1800-2000 used and that's a heckuva buy, IMO.
