$215 for a used XBOX 360 Core system? Deal or No Deal

[armyof1]

Is this a good deal for the Core system? I sold my Wii last week and I'm looking to get the XBOX 360. Do I want the Core system or the upgrades? This comes with a controller and cables.

I plan on playing sports games and halo all online. Maybe some other good RPG games if I run into any. I am not trying to spend a lot and wonder what else I would need.
I am guessing I will need the XBOX Live, a headset, and probably another controller. I guess I will also need some sort of memory device. THis is getting expensive isn't it.

THanks in advance, also the kid is like 15 I'm sure I can get him down lower... Muuhhh HAAHHAHAHHA