you should have just bought the xbox 360 elite, it came out like 3 weeks ago, and it has been built to have the hdmi link. with the regular xbox 360 you7 can use the av cable which does show that well, the component leads that shows close to hd (rendered), but if you buy the vga lead you will have the best picture on any hd tv (and thats if you dont have the elite).
i should know, um a game freak. forza 2, gears of wear ownage all day long.
hope imfo is useful, um gonna trade in my xbox 360 premium soon and get the elite as i have gone through 3 different xbox 360 due to overheating, harddrive failure (virus) and the other time the motherboard blew up.
U2U me if anyone would like a challenge online !!!