So my buddy and I are looking to get a good game for the XBOX 360 to play co-op together on Live. I'm not into the shooter games for consoles simply because I'm so used to playing them on PC and Mac (nothing beats a mouse!). We're fooling around with NHL09 right now, but would prefer a non-sport game instead. Maybe something like Assassin's Creed or Prince of Persia. Any ideas?