Svs
I just picked up an SVS PB12-NSD, and it's working out very well for me. I've got a slightly smaller room, and use it primarily for movies as well. I had to look around for it, and hop on it fast once it showed up used by a trusted source, but I paid $500 for it ($420 + shipping - it's a big 'un!)
If buying used (or waiting to find it ) is not your style, then you might consider the PB10-NSD ($429 + shipping new from SVS).
From what I've heard, the customer service at SVS is excellent, and not hard sell; I'd recommend calling them and asking for recmmendations.
Good luck!