I've heard that the Omega Theta Pi's are the best house with the most prestigious members, but it's very hard to get in and some of the guys are jerks.
Also, watch out for the Delta Tau Chi's, while they have arguably the BEST parties, I've heard they are on some type of probation and are likely to lose their charter with one more infraction. Knowing those guys, it's just a matter of time!!
Good luck!!