My first car was a 90 Geo Metro. It came equipped with 55hp 3 cyl and a 3-speed automatic. My friends gave it an appropriate name...."The Beast". I wrecked it after 13months of driving. I was waiting to make a left turn when a car stopped and waved me on. I turned and BAM! It wasn't good, but I'm glad that I was driving a Metro and not the 67 Chevelle that a desired. My next car was an 87 Toyota Supra non-turbo. I thought it was a hot car(it wasn't LOL). I went through 2 trannys and blew the motor within 6 months. My next car was a 1993 Toyota Corolla, what a great car. It was a great little chase vehicle and daily driver combo. It didn't have alot of room for equipment, but I didn't have alot equipment.
After the Corolla I made another attempt at a sports car. I purchased a 1991 Toyota Supra Turbo and did some major head work to get it ready for high boost. Let me say one thing.....sports cars are money pits and impractical for a 20 year old that is trying to get on his feet. I ended up with a 4-Runner and just drove the Supra occasionaly. I bought a 2000 Toyota Celica GT-S and sold the supra a couple of months later. Now the Celica has a RMM Intake, TRD Exhaust, Unorthodox Racing pulleys, a Centerforce Clutch, TRD(Eibach manufactured) suspension, and a Veilside body kit. This is another money pit.....but I have a little more now and I understand that you can't go around racing all of the time.
I think that it would be best to avoid sports cars until you are at least 21. Insurance is terrible and teenagers, no matter how intelligent, will do stupid things from time to time.
Nick and others......the people that are telling you these things are speaking from experience. One thing that I have learned over the years is to pay attention to people with more experience. I'm glad that my dad made me drive "The Beast" when I was 16. I would have killed myself(or someone else) with a sports car and it would have been difficult to chase in. In the end, buy what you want, but don't say that we didn't warn you. 8)