XBoxes are awesome. Good choice dude.
There's only the 4GB and 250GB versions at the moment AFAIK, and you can get them bundled with a Kinect if that floats your boat.
Although I'm sure you can upgrade the drive, I'd go for the 250GB straight off the bat if I were you, otherwise you'll just end up spending more money to get a HDD. You need the space for installing games, downloading DLC and patches, and even whole games. You might also want to store videos and music on there.
Not sure about the price. I still have the old phat version.
You are going to be paying a lot more for games than PC versions though.
