DO NOT EVER BELIEVE THE SALES TAGS IN THE STORES. I used to work in retail electronics in not one, not two, not three but 4 different chain stores. NONE of them had 100% correct info and some were outright lies!
As to salespeople, question EVERYTHING they say. I did a little research when I went in to buy my first HD set and I knew I wanted an ATSC tuner (that is your HD over the air tuner) and a QAM tuner for cable. But I did not really research models all that well before I went to the store.
So when I got to the store (HH Gregg) I told the salesperson that no matter what TV we ended up on it must absolutely, positively have a QAM tuner. He told me they all had that. I argued briefly but he was insistant. We ended up on a gorgeous looking Samsung TV. I asked him three additional times to the point that he was getting annoyed with me about the QAM capability. He continued to insist yes it did have QAM. So I bought it. When I got it home... guess what? No QAM.
I called the store and asked the guy how to activate this mystery feature. After 10 minutes on the phone with this otherwise rather nice guy, he comes back ont he phone and starts to apologize profucely and asks me to come back in to the store to pick a different TV. I ended up with a Toshiba that cost more than the Samsung for less after the "oops" discount.
Anyway, the point is, go to the store, look at the sets you like. DO NOT BUY. Go home. Research the model features on line. THEN buy. But do not buy a TV without looking at a working model first. Specs do not tell the whole story.
Good luck!
See ya
Tony