Most HD tv is broadcast in 720P so seeing both and not speaking to anything else you will not see much of a difference. The picture is still beautiful, but you may as well go 1080 as you will want a PS3.
If you aren't looking to break the bank there are tv's at Costo for good prices. One brand...can't remember the name is made by LG and actually gets great reviews. I saw a 40" LCD there this weekend for around 600$
I'm just wondering if YoursTruly is a medical doctor/health professional/someone on the inside/scientist/someone who just really doesn't like flu shots and likes finding tidbits on the web from whatever source is available?