which game sould i buy? need help here

ok my mom said she is gonna buy me one game. it doesnt matter if its rated M, if the game doesnt have nudity or sexual content (there goes mass effect) i can buy it. i hve halo3 and lost planet.. but i havt bought any games released in november. which one

oh yeah, plz dont choose the ovious ones like cod4 and gears,, cuz i have a high chance of buying those games, any good game thats old or new and not very popular

oblivions a pretty fun game that will entertain you for many many hours