My friend told me that the only difference was the the Arcade didn't support XBL (which would be fine with me actually because I refuse to play a monthly fee for something that should be free) and he also said it won't support the "new XBox experience"... the new firmware thing or whatever it is that's coming out soon. (He said that the new firmware will need more space in the drive than the arcade has) So are there any other differences? Are the differences in pricing huge? Do most Arcades have LiteOn drives? And is it possible to hook up an external drive to the 360 and use the memory from there?