ok, car apart...suggestions?

ok, today i got the chance to take the car apart looking for the leak that was caused when my water pump got disconnected and the car over heated. Looks like its just the gasket for the thermostat. That would explain the leak, and also explain why i couldn't get the system to accept more anti freeze---cuz air was getting getting sucked into the thermostat. I didn't see any indication that there is a leaky head gasket. I didn't see any dried antifreeze anywhere near the heads, and when the car over heated at frist, it wasn't smokin. That would mean no liquid was close to the hot parts of the engine.

OK well, lets assume thats the answer.
I took the radiator out to inspect it and all the hoses.
Doing this, i cracked the freakin compression fitting to the AC condenser loose and lost all my goddamn freon.
How much does it cost to refill freon on these cars?

also, i have all this shit out of the car, so im wonderin what i should do while i have this opportunity to work freely in front the engine. Im gonna put in a new belt, and possibly do my optispark. What esle? Pullys? Whats involved in doing them? Smaller pullies means i need a diff belt too right? Help me out....

What about a new radiator, like a high preformance one? Lighter and cooler. Can they still be intalled with the AC condensor and crap still there? or are they strictly for race only applications?

the fact that chiltons hand book doesn't have any info on the AC system is really pissing me off too. goddamn ozone laws