i just have simple question. about how much memory will the average ps3 game take up?? i am getting a ps3 this weekend and i have never even held a game case to look at it. so i have no idea how much memory a game takes up. i love gaming but i never have a whole lot of games. maybe 10 to 20. so im trying to figure if i need to get the 40 gb or 80gb. im not worried about backwards compatibilay because i still have my ps2. but back to the point how much memory will some of the games take up