Need to buy an Xbox Elite console for my son in time for xmas! I've been eying the new holiday bundle for $299 (I know I can get it cheaper, but I have a Dell coupon for free money!). Also looked at the COD edition and it only has an extra controller and larger HD for $100 more. Is it easy to upgrade the HDs in these things? I think the Holiday bundle is better for us (already have the COD game on PC).