Doug GTS, I don't think the previous posts answered you question - now i would have expected more from REDLED, after all he is an educator.
Here is my tens cents.
I make the assumption that you have not had a lot of track experience but like what you have done so far and want to to more.
I have developed the following list of changes to make to your car, based on your current experience. I also think this list takes into account costs of changes, so the order in which you make changes is important
STAGE 1
Heat - the fronts are going to fade due to excessive heat and you are going to boil the fliud.
1. go to high temp fluid and add Porsche cooling ducts - personally I did not have much luck with them but others have so what can I say - I installed the Henry Cone duct kit and that is quite effective
Sean Roe has a plexi deflector that helps **** air thru the wheel - some have had luck by going to a BBS type design that pulls more air thru the wheel.
You have to face the heat issue sooner or later - I recommend you do it sooner - the hotter the equipment runs the faster pads and rotors wear out.
You will also melt the rubber grommets on the suspension etc etc etc
Next - as you get quicker and get harder on the brakes you are going to flat spot the right front tire (right front of the car is lighter than the left therefore has less grip)
2. Braided brake lines - this gives you a much better pedal feel
3. Pads - you will chew through street pads.
Now this is where you start to spend money
Street pads are for the street
Track pads are for the track
Try to run your track pads on the street and you will chew out rotors
I have a set of rotors for the street and a set for the track - its a pain!!!
Stock Viper rotors are cheap - $400 for a set of fout from Parts Rack
Expensive rotors last about as long as the stock ones, per dollar spent.
STAGE 2
You should be getting more experienced, going quicker, pushing the limits of your equipment more
Now you are ready to do something about the back brakes - they are just along for the ride.
Many solutions and it is at this point you need to sit down and decide if you are going to continue at you current pace or you are going to get wild and crazy like old Redsled there, and be at the track a couple of weekends every month!!
Lots of track activity - Stoptechs seem to be the popular choice - they work but be aware you will be using their rotors - I believe I am correct in saying that thier rotors will not work with stock rotors without modification.
You really have to have a good method( as in front air ducts) of cooling these things, or any other brand or solution for that matter.
If you want just play occasionally - I think I would still recommend the Stop Tech 4 wheel solution.
I think you can see, how much track stuff has a large bearing on what changes to make to the car - how fast you are and your experience is equally important.
I now know that early in in my learning curve I was not smooth and ******* the brakes, so I was applying brake for a longer period of time and not at threshold braking, therefore generating tons of heat. I would like to think I now brake shorter and harder, am on the brakes less and generate less heat into the equipment. So I think experience or technique counts.
Equipment is always improving so check with equipment suppliers before you buy - do they have an improvement coming that might be worth waiting for.
Luck
Gavin