I vote airsoft.

I love real replication of weapons. It is so similar, that to a "noob" they could not tell if it was real or fake from afar.

I actually just got back from Airsoft Atlanta today and bought a Echo1 MP5-J.

Full auto, and semi auto. The fire rate on this thing is insanely fast. 350+ fps, metal hop up chamber.

I had loads of fun with it today.
My friend actually bough a SIG too w/silencer. This sh!t is so bad a$$.

I just really love the realistic look and feel to all the guns rather then paintball guns. (no doubt paintball is fun as hell to though)