The 30" will run fine off a 30". I saw a CD MBP 128 MB X1600 run a 30" in an Apple Store, and since the X1600's in the C2D MBP's have a highher clockspeed, it'd be great.
Computer monitors aren't designed to watch TV on. Sure it'll look good, but you'll be much better off with a big Plasma/LCD from Shard or Samsung.
you'd be better off buying a real television if that'd be the monitor's primary purpose.
i don't know what you'd do if a pixel burns - i think Apple will only replace it if it's more than eight pixels (i don't remember where i heard this - it might've been from my friend who works at the Apple store).