Looks like your question got answered as you were posting. I knew something was forged in the motor, just forgot it was the crank.
Just remember, there's no set power level that your motor will give out at. It could go at 350 just as it could at 450. The key is a GOOD tune, supporting fuel system, and keeping air intake temps down. If you blow your wad on a blower and motor put go cheap on the supporting mods, you will pay for it.
My personal advice is to do a lot of research on which blower you want to go with. Then save for it, buy it AND invest in a quality fuel system. Then find a GOOD, REPUTABLE tuner to tune it for you. Instead of pushing the stock motors limits, keep it around 8lbs of boost (or 10 with an intercooler) and enjoy the car. Thats still plenty of fun power. If you decide you want more power, start saving for a built motor, then up the boost.
Just keep in mind its not as simple as a built motor and blower. They require supporting mods and it adds up quickly. Good luck with your decision, let us know how it goes.