I have a low gmat score (560) and these are the universities that got my attention,
I´m going to apply them all but which you think are the best ?

Pace University (NY)
Gonzaga University (DC)
Willamette University (OR)
Florida international U (FL)

thank you very much

These are all highly regional schools. Where do you want to work? What's your career goal?
If you are a US Citizen then even with 560 GMAT and depending upon the strength of your profile you can get into US News top 70~80 ranked schools.

We have had several sub 600 scores at College of William & Mary.