The Revel sound is fairly DEAN-NUTS neutral sounding, and should do well with a lot of options. I think any amp you choose will simply be revealed(no pun) for what it is through the revels largely...that is if you can get away from YOUR OWN ADDED COLORATIONS due to your set up ability! If you make me sound bass heavy, they'll sound warmer overall. If you make em sound lean(via placement), they'll sound a tad hollower and more tipped up on the treble for perceived balance!
I once heard a guy's at his house who had em WAY WAY too close to the corners, and the bass was thick and boomy. The result was a bloated and way warm domination of the midrange.This was different than from what I've heard at shows and demo rooms.
That sais, the speakers are very neutral sounding like competing NHT's, and siimilar in the same price range.
If you like tube warmth, you can add one of those. If you dig solid state, the differences from amp to amp will play through I think.
If you find an excellent high end amp out there from review and suggestions, you'll probably like the sound. After all, the speakers are at least half of the sound of the gear all together. You shouldn't have problems trying different combo's for your ear and taste!
Have fun.
I think the older Threshold T series or SA series should sound awsome for the money with those! Good luck