Cost should be your #1 priority, but first-time pass rate should be your #2 when choosing a school. The NPTE is a big, hard exam that costs a lot of money. You can only take it 6 times. You're paying a lot of money for PT school, so they should be preparing you well.
Don't go to just any school that accepts you. Keep an eye on the pass rate, and only go to schools with at least >85% first time pass rate. >90% is better.
Whatever you do, don't choose Concordia in Ann Arbor