help me a pick a new game =)

Hey guys, i havent played my 360 in a while and wanna get a new singleplayer game to get back into it.

I like most catagories of games so dont hesitate to suggest anything

I currently own:

Oblivion, COD3, PGR, Gears of War, Viva Pinat(¬_¬), and Vegas

Im thinking about getting Ridge Racer or Dead Rising however DR seems really short.

Thanks 

Dead Rising was pretty good. It lasted me a pretty long time, but that's cause I was trying to get all the achievements...

Ridge Racer sucks BTW. 

Dead Rising is the better of the two. I've never really been into racing games though.

I've also really been enjoying Call of Duty 3, if you're interested in that.