Quinn....there are a couple of obvious choices in the $400 price range right now.
Most would recommend the Pioneer 1014 becasue it is THX Select, has MCACC and DPL IIx and some say is almost the same as their Elite 52TX. You can get it on-line for about $400.
Marantz puts out some very nice AVRs, too. I'd go to
www.ac4l.com and take a look at what they currently have in stock. I've done business with them several times. They are the only Marantz authorized internet dealer and customre service is top notch. They also have good prices.