Choosing School for Pre-Vet

I have been accepted to University of Michigan (Ann Arbor), Purdue University, Colorado State University, and CU Boulder in their Biology programs and am planning to go pre-vet. Have visited UMich and Purdue and definitely like the large school feel, but am torn between programs. Any prior experience or suggestions as to which would best prepare me for being accepted to vet school? I am planning on doing research within the biology department during my undergrad, and am not concerned with tuition cost at this time, just want some advice on which program would be best.