HELP Amp for Revel M20?

At 87db per watt meter at 6 ohms nominal the little guys are juice hungry. I couldn't find Revels recommended horspower but I would gather ebven in a smallish room that you will need 100 high current watts . Since it has all metal drivers, I would imagine you want warm watts.
See if Oddysey's top all Class A amps fit your budget.
CJ are as rule quite toasty sounding,
A Mac might be too hard smack down SS and too much money but they do work great with my squealing Old Klipsch LasScalas.
An older SS ARC amp is a good choice if refurbed.Not the digital SS they use now.
As for tubes you'll need to spend more for that kind of current.

Mark Levinson monoblocks are about what you need. Tons of clean tight power. On a budget, find something with at least 300 wpc. I love Mac but think it's too soft for these.

Congrats on the M20s, fantastic speakers at used prices. I used a Bel Canto eVo2i to drive my M20s with excellent results.