[Tachyon]

I would agree that your prices seem a bit... light. Some of those parts can be had used for around there if you are willing to wait for extraordinary deals, however, I would not bank on it.

500 WHP on an Evo III turbo is a very taxing build. Turbo simply cannot keepup with airflow demands as the RPM increases, it's just physically too limited. Because of this you need to achive dangeriously high cylinder pressures by spiking the turbo to around 32 psi coupled with agressive timing (25* during the spike and max TQ area of the curve). This will get you in the neighborhood of 450 WHP. Obviously this can only be attempteded on high-octane fuel. The major drawback that prevents most people from doing this however, is it tends to kill your turbo quick fast.

I've been doing this with 14b's and 16g's for the past few years, and I get roughly 3 months from a used turbo before very bad things happen.

Good luck with your goals!