Okay heres what you do. buy the used 250 dollar one, which is a really really good deal. Don't get it on ebay. Shipping will be rediculous and its not guaranteed to be in very good shape. Then buy a used harddrive for 60 bucks. Which is sooooo worth it. Then buy GTA IV for 60 bucks. that comes out to 370. You should also get xbox live because its one of the best things that system has to offer.
i bought one off ebay for 250 total including shipping, insurance, hard drive and wireless controller.