We got ours at sams for $650. I forget the size, 50 something. We are very happy with it. Sams, bjs and hh gregg had the best prices around in our search. (Bill is thrifty) Costco is probably a good option too. I would look at those places for sure, unless you are brand specific. Good luck!
The big clubs have a good selection and they are all close together, so you can definitely compare. HH Gregg's sale prices were just as good as Sam's, but we went with the one at Sams because we already had one Vizio that we are really happy with, so we went with another one. (I looked on their site, but don't see the one we have on there. We got ours right before the holidays, so they may have had a larger selection at that particular time)
I honestly don't think that in the price range we were looking, there is much difference between the various brands. Just depends on how you personally like the picture.
We ended up getting a 42" Vizio at Walmart. He almost got the LED one but it was 150 more and decided it wasn't worth it. We had a large, old rear projection TV so anything was going to be an upgrade.
