The one that I'd trust the most is Crutchfield, but with the exception of some rare but really good sales, they are more expensive than most.
OneCall holds weekend sales with some decent deals, and I'd trust them.
Amazon has surprisingly good prices on some TVs, and their price (at least on every TV that I've been interested in) has included their "white glove" delivery. Customer reviews seems to speak highly of their service. Plus, I've been very happy with Amazon making a purchase right if anything goes wrong.