Best amp for $550 to mate with the following...

My budget is $550 max on a power amp to mate with my Theta Miles cd player and NHT VT-1.2 tower speakers. I'm running the Miles direct into the amp (therefore using its analog volume control). Locally, I have a lead on an Adcom GFA-5802 for $550 or an Audio Refinement Multi 2 for $445.

Other possibilities/recommendations?