Everything Andyg said. Actually 700 to fix the AC isn't too terribly bad, just be sure that includes a new compressor, receiver/dryer, expansion valve, and a good flushing plus the evac and recharge. If the current compressor seized up, it most likely spewed debris throughout the system. If that isn't cleaned out it will cause problems down the road. Also see what kind of warranty they'll back their AC work with. A decent warranty is good insurance. These vans don't do so well without AC, especially if it gets over 90F where you live. Two vent windows and two open front windows don't make a very good 4-70 air conditioner.
-1999 Plymouth Grand Voyager SE. Factory Emerald Green, with aftermarket rust accents ("What rocker panels?!") 192,000 miles (and counting) with the 3.8L and ORIGINAL 41TE. The Spinach-Van!
-1996 Plymouth Grand Voyager SE, Factory Rosewood paint with ZERO rust, 3.3l, 175,000 miles. The "new" van. It's a baby. The Eggplant-Van!