You might want to check out the Outlaw Audio RR2150 Stereo Receiver. It's only two-channel but it runs 100 watts per channel. That should be plenty of power for your Aerious if you don't use them in an auditorium. They were running a super special for $500, I believe. I don't know if they are still on sale. The regular price is $699. I have read rave reviews on this amp.
I'm not crazy about "surround sound". More channels in one amp means more compromises to the quality of each individual channel, unless you're willing to shell out several thousand bucks for a top-of-the-line model. You'll get more bang for the buck by going with plain old classic stereo. Besides, about 90 percent of the sound from any source is located up front anyway, especially with music. "Surround sound" is basically a flashy gimmick designed to sell people new equipment, it my opinion. I use my Martin Logan Aerius in stereo only, whether it's listening to music or watching TV.
You would be surprised how lifelike the sound is with just stereo, when using them for telvision and movies. Personally, I'd rather have two great channels than five or six crappy channels.
I use the Rotel RX1050 receiver with my Martin Logans, and I am very satisfied with the results. You might look into that model also. Before that I had a Yamaha integrated amp from the 80's. A good Yamaha might give you nice performance for the price range you are looking at. For something in the 600 dollar range, I would highly recommend you go with stereo rather than surround sound, for the reasons I had previously mentioned. As you already know, Martin Logans are all about fidelity. Better to have two channels of faithful reproduction than six channels of whiz-bang crap.