I would have to say that you should probably get a Flowmasters 50 series. Reasons?

1. Cheaper than getting a stock one (with installation at most 130)
2. Less restrictive on the engine (not enough for you to notice, but you have a S/C so it'll help more than you think)

I could give you more reasons, but the reasons are based of how cool it sounds. I have a 40 series, and I love it. Also! Since you have a S/C, the S/C will drown the noise of the Flowmaster on hard acceleration.