Samsung and Sony are only two manufacturers I tend to buy. Samsung being the #1. Could be just personal preference, but every time over the last ten years I've gone to buy a flat screen, Samsung has had the best reviews and feature sets for my price range. Not to mention looked best in the store.
Whatever you decide, make sure you do your research. Go to a local store that has the ones you're interested in and try to compare side to side as best you can. All you'll get here, for the most part, are people's individual preferences. Be an informed shopper and you can't go wrong. Above all else, make SURE you don't buy online. Buy from a local store. Nothing sucks worse than to spend $675 on a nice TV that costs $750 in the store only to have to return it at a cost of $75 in shipping. There goes all your savings and you go weeks, if not months, without a TV.
Well, I'm just about to have that experince. I would be returning two monitors to get $500 back and probably cost $50 in shipping.