why is your s/c belt off? when on is it making a rocks tumbling around sound at idle? and if you take the s/c pulley in hand, and snap it back and fourth do you feel play in the shaft and feel a clicking?
if so thats just a coupler and is fixable and can be run like that. the only pulleys you have to replace possibly are idlers and tensioners. the rest are water pump, p/s pump, a/c, alternator and harmonic balancer.
the window, you need whats called a power window regulator, its the motor and new track. easy fix as well.
a/c, yeah that can cost ya, look for a oily mess at all the a/c connections or sensors, the oil mess is from the leak. you may need to wipe it all down clean it up good, charge it with some dye stuff, and wait to find it. or get est at a a/c shop and bite the bullet.
fixing this car im sure will cost less than finding another used car with unknown problems, at least with this car you have a good idea whats wrong and what needs to be fixed asap.