I'm no expert, but if you want a budget TV with minimum input lag and thin bezel, and don't care about 3D, I don't think you can find many better than Sony's W6 42" (
HDTVtest review). You might have to stretch your budget slightly, though. Or you could get the 32", but that apparently has higher, though still low, input lag.
Got the 50" (W656) myself a few weeks back and, apart from strong horizontal banding (think that's what it's called?) across the top of the display, I couldn't be happier. (Decided not to get a replacement, as it's just a one cm wide line that shows up lighter under certain lighting conditions and the uniformity of the rest of the screen is great.) Input lag feels non-existent and the motion blur looks "cleaner" than on my five year old Samsung (less artifact-y? smear-y? I dunno

). The Led Motion option to improve motion resolution is worthless, though, as it introduces very distracting ghosting and darkens the image way too much (tested with Rayman Origins).