I do not recommend Vizio. They are ok, but not great. You really do get what you pay for. For your money, I suggest Samsung. And I always suggest 1080p native resolution. You do need to go to a store and look at the tv ,but don't read too much into comparing sets in the store. You don't know what settings they've used on the floor models. I recommend that you get a model with a matte screen. Glossy ones reflect any light in the room.
I bought mine from Circuit City (on sale of course). Costco is another great place.
Once you've narrowed your search go here...
AVS Forum and see what others are saying about that model.