i am thinking of purchaseing an xbox 360 and i have come across the arcade i am wondering, is it good for playing just games? (i don't care at all about playing dvds, adding music/ photos or anything like that) the only thing i care slightly about is xbox live but it doenst matter if it can't play it. all i want to know is 1. does it play ALL xbox 360 games or as the name surgests, only arcade games? 2. can you buy memory cards for it. 3. i have heard it already has some built in memory, if so does it have a decent amount for saving my progress on games?(i don't care about downloading them.) i can not currently think of anymore questions, if i think of any i will add them. thank you in advance.