Need a New Game.. Ideas?

Aight I got paid today an I wanna get a new game, I'm thinkin' Overlord but iunno.. I wanna hear from real gamers what a good game choice would be..

I already have:
Oblivion
Spiderman3
Condemned
Saint's Row
Dead Rising
Gears of War
Hitman
The Darkness

I plan on gettin Mass Effect, GTA 4, Assassin's Creed, Devil May Cry 4 and Resident Evil 5 when they come out, but I need a new game to hold me over for a bit.. either Overlord or RainbowSix looks interesting, but just know I dont like war games and dont want a racing game yet. Any help would be appreciated. Thanks

Overlord is a good game (played the demo on 360 and own it for PC) but there's no actual online gameplay, so once you pass the game, you can either reply it as a different path (good or evil) or use the disc as a coaster. Rainbow six on the other hand you not only play throughthecampaign missions(which mostly are fun) but the online IS ADDICTING, so even after you finish the game you can have hours of fun online, for the 360 Rainbow Six is one of the must own games, but if you don't like shooters get Overord.