At the Mercy of the Repairman

It's the 3rd week of June, 2009. My home a/c has stopped functioning properly. I call the home warrenty company that covers my home and insures that I do not have any unexpected utility outages that cost a ton of money. They tell me that since it's been more than a month since my last call about my a/c, that I will have to pay an additional 65.00 service call, but that is all. Ok, that's a deal.
It is now the September 13, 2009. My a/c is still not working. Not working as in no cool air comes from the hole in my ceiling where the cool air is supposed to come from when the a/c is working.
Now, it is down to this: Repair vs Replace. Warrenty vs No Warrenty. If the warrenty is to cover the replacement, then I have to deal with the company that has not been able to fix it all summer, but it will be paid for. If I do not use the warrenty, it will repaired, but it will cost a couple of thousand dollars, but it will be fixed. Sometimes, I really don't like being a responsible adult. This is one of those times!