Best bet is stay with brand names - Samsung, Sharp, Toshiba, Sony are all good bets. I'm not so crazy about Vizeo or Olivia.
The brand name TVs you listed are all very good. I just want to add that we have an Olevia 32" LCD in our bedroom, that's been operating for over two years now. I would estimate that it's on 6-8 hours a day, everyday. The picture is very clear. The colors are very vibrant. The blacks are decent.
The only thing I dislike about the TV is the annoying bright blue LED, that turns on when the TV is turned to off/standby. At night it seemed like a floodlight was shining in my eyes. I ended up putting black tape over the thing.