Tricky question. Much of the car was in place from the 90's when I did the work myself...ie the disc brakes all the way around and the 9 inch. I converted the car to a 4 speed top loader. So I had some of those parts as well. There are some other examples that slip my mind, but it kept me from buying some of the parts and only having to refurbish/clean them up.
The motor (used my block) cost about six grand... stroker kit, aluminum heads, custom headers...including parts/labor.
Trans is a T5 out of a 93 Cobra...used 800.
I could go on and on, but it really makes a diff if you are buying new or used and how radical you want to get with the suspension, brakes, motor, etc. What condition car you are starting with, and who is doing the work. I chose to have someone else (professional) do the majority of the work. I safely have about 30,000 in the car as it sits. I have it insured for 35,000.