I got the game as well and it's sick as hell!!
Heresy: you can only use the xbox 360 hd for saving etc, but you can use your own external hd for playing music, videos, viewing pictures etc. you just can't save any content onto it. and yea the premium version is definetly the way to go homie. once you get your hands on that wireless controller, you won't regret it. i got my shit on a 5.1 surround sound set (only way to game!) saving up for a hdtv, for now i have 27sdtv, but picked up the vga cables and play on a 19in dell lcd monitor (the cables allow you to use high def resoultions).