This is a damn good thread.
I'm also getting a S13 (i know, but there cheap. bite me) and I'm am also looking at the "disco potato" and 350 whp is my goal also. I wasn't sure if that turbo was all hype or not, but it might find it's way in my car.
Of course that wont be for a while. Suspension, wheels, brakes, then SR20. Then, after that 350 whp.