I picked up an A820 from Newegg a few weeks ago for about $550. My first real home theater, and I'm very happy with it. Automatic setup with YPAO seemed to work fine without doing a software upgrade. It's driving JBL L890s, biamped, with an LC2 and LS30 surrounds, all recently purchased from Amazon. It seems like plenty of power for my purposes, and I've used it for music more than video so far. And dialogue lift is very effective.
Both my TV and BluRay player are Samsung with built-in WIFI, and I've streamed a lot from Amazon. I tested briefly and streaming to TV with ARC to the A820 seems to work well. I'm not sure whether there's any downside such as loss in sound quality. I always expected to get a media bridge for the receiver, but if there's no downside I might hold off.