AJT,
I have a 99 GTS that is pretty quickly turning into a track car with all of the mods I have done to it. I put the 4 wheel Stop Tech kit on my car in October. The main reason I did it was that on stock brakes/lines my pedal went to the floor going into a high speed turn and I took an off track excursion. Luckily there was nothing but grass to run off into, but if it has been at TMS there would have been a concrete wall to greet me. The repair cost would have been much greater than the $5,000 for the brake upgrade.
That being said, if you go to the VD events 1-2 times per year, at the very least you should put stainless lines on your car and Motul 600 in your lines. Then pay close attention to the brake feel as you go into turns. The VD or track events would be the only place you will boil your brake fluid based on your post.
As a benefit, the Brakeman #3 pads wear much longer with the larger pad surface and less time I actually spend on the brakes since the Stop Tech brakes stop me in a much shorter distance than the stock set up. That wasn't in my thinking when I bought the Stop Techs, it was a benefit realized after running the car at the track. My Brakeman #3's have lasted more than three times as long as the stock pads/brakes.