Here are somet things to look for...
Widescreen/ HDTV/ with DVI
Plasma's only last 4-5 years, but LCD which are more expensive are the better buy. They just started making LCDs a lot bigger and therefor the prices are high.
I went with a 60inch Philips Projection Screen.
Projection HDTVs are bascially your best buy with everyone spending their money on flat screens. I would just get a projection screen and wait a few years until LCDs go down in price.