I wouldn't recommend a Vizio unless you really have no other option.
Brands I'd recommend:
Sony, Samsung, Sharp, Panasonic, Philips, Pioneer, Toshiba, LG, and, to a lesser extent, Sanyo
Brands I'd avoid:
Westinghouse, Vizio, Daewoo, Venturer, Fuh Yuan, Funai, etc.
The price on Samsung's products isn't really a premium. You get what you pay for.
Sony's TVs, however, could be considered to have a premium. They're generally better TVs (the XBRs are the best LCDs on the market) but you pay considerably more for them, and many feel that the added price isn't worth the added value. Samsung generally produces the best LCDs after Sony, with Sharp at a close third.
Samsung has also made great forays into the plasma arena, with their new HP series, though Pioneer still reigns supreme for high end plasmas.
Edit: C|net is the best source for reviws of CE products, especially televisions, imo.