Looking for a new powerful amp.

I just purchased a Audio Research Ref 3. Now I'm looking to purchase a new amp. My current speakers are Tannoy system 1200's. the new amp must be able to play very loud at times. the type of music ranges from R&B to Hip Hop to Pop.
I may eventually be changing the speakers to Vandersteens 5a's.
I was thinking maybe a Krell amp???

please give me any feedback you might have on the speakers and amps.
thanks!