heeeeey, me too! theta sigma chapter (southern utah university), and i was on panhell as well! small world
I graduated from MIT nearly twenty years ago, and when I pledged Alpha Phi, it was the only sorority on campus. At the beginning of my senior year Alpha Chi Omega started a chapter and I ended up being the first Panhellenic president, overseeing our first competitive rush.
I think there are at least five sorority chapters on campus now, and I have no idea which are considered best. MIT depends upon the fraternity system in order to house its undergraduates, and thus nearly half the campus is Greek.
Although PanHel and IFC members have some of their own activities, they're not viewed as particularly exclusive and most events are open to all. Some houses are perenially struggling and others live high on the hog. There are several co-ed frats too. MIT offers pretty much any type of living situation a student is looking for.