PS3 slim Black Ops Bundle or Xbox 360 Gears of War Bundle?

I'm in a pickle, I want either the ps3 Black ops bundle or the Xbox 360 Gears of War Bundle coming out in September. I have enough money to buy either one. I'll be playing online and I have friends that play both ps3 and xbox. I like Killzone 3 and Gears of War 3 seems pretty fun. Should I wait for the GOW 3 bundle to be realeased, buy a normal black xbox, or buy the ps3 Black ops bundle?