1996 Chevy Beretta Coolant/Water leak under car

I have a 1996 Chevy Beretta with 112,000 miles. I last January of 07' replaced my head gaskets. I also replaced my radiator about 1 1/2 year ago. I just about a week ago saw a big leak under my, just about the middle of my car. I noticed that it was leaking brake fluid. But then I put more fluid in for the brakes. But I still noticed the leak. So my car started to get hot, then go back down. Since then I have put radiator fluid and water in and it just pours out of the car when it sits. There are no leaks from radiator hoses. Or the radiator. What is the deal? Is it a water pump? And how much would that cost as I have already put in a lot of money into the engine? Is it worth it to replac the water pump if that is what it sounds like?

Thanks,

Jonny