Dude, it's totally worth getting one for Mass Effect; it's awesome, as all Bioware games are (the main reason I considered getting the Xbox first time around was the two KOTOR games, which I played last summer when my friend Travis lent me his original Xbox).

I'd recommend you play it (they've got a PC version out too, though it needs a pretty powerful PC). Or, even better, Knights of the Old Republic (which is available for PC, and since it's older it's both cheaper and works on even not-blazingly-fast computers), since I know you like Star Wars, and KOTOR is a SW RPG that's actually good, which is kinda shocking.