May I recommend you make sure, you definitely make sure, that you will have finances and technical expertise in line before you jump on turbo'ing a non turbo car, especially a 19 year old one.
I am 20 and in college, and I am finding how hard the whole project car thing can be, especially if its your daily driver. Keep all of this in mind.
My recommendation is to buy a base begi-s kit. Base. Keep it simple. No need to intercool or do a standalone. This way you can learn the car and slowly work from there. This is the fastest way to get turbo'd reliably and easily. This is the best bolt on solution.
On the other hand, if you want to learn a lot. Get a megasquirt standalone and learn the system. Learn how to tune your stock car. The megasquirt will control nearly every parameter you could ever imagine. Then slowly buy parts understanding it will never be plug and play like the base model begi s.
I went the wrong route, and without the expertise to diagnose every problem on my car, ended up dishing out a lot of cash I didn't need too AND went a long time driving the parents spare car.
Throw in do everything everyone else was talking about, make sure you have everything else in line, diff, tires, rollbar. Get a rollbar. You will be decapitated without one. I'm serious.
Miata Hard Core Bar