its been mentioned before but i agree spend the money of making the car handle and stop before you look at power (dont cheap out on tires and wheels). first power mods i made to my r33 were bigger injectors i put an r34 turbo in with 3in turbo back exhaust front mount z32air flow meter and new computer with nistune, with the r34 turbo im running 17psi.
im now looking at either building a forged rb26dett or doing an ls1 conversion because im used to the power now.