When I bought mine I figured I was going to have it a while so I splurged and got a Sony Bravia 46" 1080 LCD. No knock on 720, but I can tell the difference in resolution between 720 and 1080 and to me it's worth the higher price. When I bought my set, the price of plasma was taking a nosedive. They can be bought cheaper than LCD or LED sets and when you compare them in terms of picture quality the reason for the price difference is pretty obvious...at least it is to me.
There is another HDTV type you might want to consider-DLP, which is made by Mitsubishi. I've seen a few of them and the picture definition and clarity is better than LED, in my opinion. The prices are also quite good. I saw a 65" set for sale that was priced less than $200 more for what I paid for my Sony, but it was too large to work well in my house and the store didn't have a smaller one in stock. I also didn't know enough about the technology at the time and Mistu has manufactured its more than its fair share of lemons over the years so I stuck to the tried and true.