Don't sell it. You'll regret it in the long run. You'll sell it and temporarily have money to buy whatever, but then a new game will come out and you'll have to buy a new 360. I've been through this cycle before and you end up buying the same system like 2 or 3 times and in the process, lose a lot of money.

I would say:

1. Rock Band or Guitar Hero 3 (Rock Band is much better and more fun , GH3 is cheaper).

2. Call of Duty 4

3. Halo 3

4. $60s worth of MS points for XBLA games.

Sports games and single player adventure games are always rentals for me so I would say rent Mass Effect/College Hoops/Assassin's Creed. Personally, after I beat the game once, I rarely ever play it again unless there is a good online multiplayer mode. I wouldn't get the Orange Box because CoD4 and Halo 3 have much bigger communities on XBL. If you really want to play the Orange Box, get it for the PC.

http://www.gamespot.com/news/show_blog_entry.php?topic_id=25958740&sid=6180351&action=convert&om_clk=latestnews&tag=latestnews;title;2

I have done extensive research myself and have concluded that Global Warming is caused by the excessive numbers of students commuting back and forth everyday. Who do you blame? The car? The Student? The Schools? If you use this article as precedent, you blame the videogames because every student has a videogame in their home.