McIntosh MC275V monos versus MC501 monos?

I currently have a McIntosh C2300 and one MC275V. I would like opinions around major differences to be expected between running two MC275V in mono configurations versus selling my current MC275V and getting a pair of MC501 monos. I will be using these with a pair of Klipsch Cornwalls III, so I am not considering the 501's just for power. Up to now I have had a strong preference for tube amplifiers, but never tried a McIntosh solid state amp. No local dealers for McIntosh so I need to be certain which way I want to go. I wont get a chance to test these in advance. Thanks!