I have had great luck with Alamo, a few minor problems but nothing that was not taken care of immediately and to my total satisfaction.
As an aside, I just rented a standard (full size two door) through Priceline. The total for seven days in mid Sept. is 146.00. This will be with Avis. Also my third rental with Priceline. The first one was with Alamo, got what I rented, no problem. Second with Avis, went from a mid size to a full size two door (Monte Carlo). Again, no problems. The rate you have is high, I would try Priceline and go LOW. I put in a bid for 15.00 for a intermediate and was rejected, then put in one for 17.00 for a standard and it was accepted. I would only do this if I knew my dates were concrete (which they are).
Considering the business Alamo does, it says that many are happy with them. If all people were unhappy with them, they would be totally out of business.