I purchased the Panasonic A120 a few months ago and I have been very, very satisfied with it. It hasn't had any technical glitches (pixelation, skipping, etc) so far.
I purchased it for $349, but most places sell it for $299 now. It does not have a built-in AC-3 decoder though. For that you have to step up to the A320 (+$100 or so).
Here are two links of professional reviews.
[Link: smr-home-theatre.org][Link: dvdcityusa.com]