From what I've heard, 1080i and 720p are essentially the same thing. Or put another way, the differences are negligible. 1080p, which is superior to both, is what I'm going to buy. A 40", either Samsung or Sony.
Zod
I have been swearing by all things Samsung for the last 3 years or so ... all my PC monitors and TV are by them ... no problems and flawless since day one.
Really funny as 10 years ago Samsung was on the level of Emerson ... and now they are kicking Sony's ass left and right.