O.K, we are in the market for a new TV and I figure the Black Friday sales will be the time to buy one. What I don't know is which HDTV to buy. I mean there are 720 sets and 1080 sets. Is one better than the other? Are programs broadcast in one format more than the other? This is what I consider a major investment and I don't want to buy something that will be no good in 6 months. Any advise? Thanks in advance..