Revel F206 power needs/Amp??

I agree with Tom. Although the Revel's impedance is rated at 8 ohms, it's impedance curve frequently drops below indicating this speaker should have an amp with some power. That and the 88dB sensitivity would not make a good match for the Rotel RA-1570.

You need an amp with high current, which the Rotel is not (only 120 wpc into 8 ohms). This does not provide the power for lower impededance speakers like the Revels.
What Tom says is correct; find an amp that can double it's power and drive a 4 ohm load. (Look for an amp that states it's watts into 8 ohms + watts into 4 ohms).

You need to tell us your budget and am I to assume you are looking for an integrated amp?

Musical Fidelity makes nice gear and from what I read about the A5, it's got power into 4 ohms and it has a phono section.
I think it would suit your needs nicely...one area of caution is to find out the history of the unit; how old it is, how hard was it driven (how many hours). I don't know what year the A5 was introduced, but if it's over 15 years old, capacitors and other electronics should be checked. It will play fine I'm sure, but it's approaching time for a tune-up.

http://forum.audiogon.com/cgi-bin/frr.pl?ramps&1194309308&&&/Musical-Fidelity-A5-Integrated-Amplifier

BTW, McCormack is a very high quality amp and hard to find on the used market. You would want one that has been serviced.