xbox 360 querry Options

[Alisha]

recently i was thinking of playing ffxi again, but i thought why continue to play it on my ancient ps2 so i thought of getting it for the 360. also the 360 is starting to have a lot of rpg's i want to play. so i looked in ads in the sunday paper and now im confused because theres 3 models. so i thought maybe you guys could help me. the arcade system is obviously appealing because it's dirt cheap but does it have a hard drive? if not can i buy one for cheap? theres a middle one i dont know what its called and theres the elite that looks sexy just because it's black but it costs the most. why does it cost more?


ps. i played castle crashers on my brothers 360 when i was house sitting for him and its awesome.