Estimate for about half that $6,000 is going to go to the motor and trans. Maybe even a little more.
This thread here is a good one to get a idea of what you need. I don't see the price of exhaust in there though.
http://www.thirdgen.org/techboard/lt...ice-lists.html
Thats going to put you right around your budget, and this is doing everything yourself and not taking into account anything along that way that you need.