I recently got Deus Ex thanks to my PS+ subscription. I have to say I am enjoying it, but I have not invested much time into the game. You should give it a try. I am very impressed with how diverse it feels and the way you can level up your character.
Though im not really a fan of Gears of War in general, 20 bucks for Gears 3 sounds like a great deal.
Got Deus Ex for about 6 bucks on a Steam sale eariler this year and i've yet to play it. LOL, too much Skyrim and BF3.
Have you played Gears of War 3 with friends ?
Coop makes the game much better for me.