welcome mate..good choice for choosing this car.
and try to find one as in standard form as possible..it will be a really good start for you as you know all the stuff you will be putting them in..
If you want a lower mileage one that is pretty bone stock have a chat with Mike @ Torque GT. He's imported a lot of S15's for a lot of happy customers (like myself).
Might be the only way to play it safe and get one which you're happy with