Can Someone Help Me To Select A Good Uni?

Hi !
My girlfriend and I have applied to US universities for 2012 fall. We got several offers already but need your expertise to choose the best option .Your help would be greatly appreciated.
My girlfriend got 1020 for GRE (295 for revised GRE) and 90 for TOEFL with GPA of 3.51 (use World education service to convert GPA to US system),
She graduated from University of Colombo, Sri Lanka on 2011 with BSc special in Molecular biology and biochemistry.
She got offers from
University of Arizona
Wayne state
Auburn
Kansas State
University of Texas at Arlington
Washington State
I got 1200 for GRE and 108 for TOEFL
But GPA of just 3.1 with BSc special in Chemistry from University of Colombo
I’m in waiting list of Carnegie-Mellon.
University of Arizona but got offers from Washington state, Wayne state