Okay...
If were going to be a founder of a university, and I'm asuming you would want a greek system from the get go-who would you invite? Here's my list. Don't get offended if your orgs not on here. These would be ones I've had the most interaction with and know the most about. Plus, its only to start. Others can be added as Optimist University growns bigger and older.
Fraternities-
Sigma Alpha Epsilon-my cousin was/is at Youngstown State in Ohio. He's a good guy, so I guess they are too.
Pi Kappa Phi-my uncle's fraternity.
Phi Kappa Psi- another cousin is one. Plus, wilson was a good president.
LXA- you's good people.
Theta Chi- Yeah, since I'm one. Philosophically sound and morally secure. Alma Mater first, and Theta Chi for Alma Mater.
Sororites-
Tri-Sig. Read the post about the girls jacket if any confusion as to why. She was/is a tri sig, I believe.
Sigma Kappa. They seem cool. Plus, they have two different shades of purple, and ya can't go wrong with that.
Delta Zeta. The ones i know are nice. Plus, not too hard on the eyes.
Zeta Tau Alpha. I was at a party and one of the girls had a mirror keychain that said I heart ZTA. She was looking at herself in the back side of it that was just a mirror, looked up at me and said "Zeta serves many purposes."
Chi Omega. I love them.
Of course it will be a very pro greek campus, and everyone else is invited to expand there. But these orgs will be there before classes start. Only 10 at first, but there will space set aside for about 20-25 more. Nice houses too.

Go OU.