Question between 1080P, 1080I & 720....

I have a 42 inch Hi Def TV that is 1080P and I have a HMDI cable plugged in the back of it... my question is, what settings should I put my 360 to?

On the back of the boxes, it says it's 1080P and I've heard people say that all the games are actually 720, just upscaled... so I really don't know what to do, would it look better if I was to put the imput as 720, or keep it as 1080?

I'm trying to get a 42" vizio during the holidays, prices are going to drop like crazy. I think 42" is as big as you need unless you have a truly enormous living room or something.. I know people with 60 inch screens and it's just unnecessary.dirtydishko2

yea 60 inch is too much.....i guess if youve got the money....i have a 32 inch and it rocks. :) very happy....to top it off it was free

I agree with those above that you should go with the native setting for the TV.  I doubt you'll see any difference in the picture quality, but it may process the signal slightly smoother.

As for those talking about having "too big" of a television, well it really does depend on your setup.  I'm one of those people with a huge living room and I have a 50" Samsung (PN50A550).  It's actually a little undersized for the room it's in, but my 360 looks stunning on it.  I would highly reccommend it to anyone looking for a new HDTV.