Are you planning to rush in the fall? Are you an incoming freshman or a continuing student? Anyway - good luck to you. Here's what I know.

The old houses with years of strength would be Pi Kappa Alpha and Kappa Sigma. (Robert Redford was a Kappa Sig at CU.)

I would recommend you check out Pi Kappa Phi and Phi Delta Theta. Both are relatively new on campus, have gotten together some amazing numbers, and have developed a pretty good (gentlemanly) rep. Also check out Phi Kappa Psi - along the same lines but even newer.

Also - last I heard Phi Gamma Delta and Alpha Tau Omega were pretty strong.

As everyone likes to remind you - go in with an open mind and check out everybody. I've been gone for a while and my info might be old or incomplete. Also - "The best fraternity is the one where you feel the most at home." Good Luck.