Kappa Sigma is an awesome fraternity at Pitt. There was some problem a few years ago with housing (Pitt has the most convuluted fraternity housing rules EVER) but they're the hugest off campus fraternity. I think they're bigger than some on campus fraternities on our campus. They're awesome guys who have great parties and they're involved on campus too. We had such an awesome mixer with them last year and we're trying to get one organized for this semester. Great guys who have great parties.