As was suggested, go OEM (through the parts folks on this web site, not sure if they do exhaust, but they do have fair prices), or go lifetime stainless through http://www.timevalve.com/

I own two of their systems, one 10 years old and not a like of rust or trouble. The exhaust will take on a "bassier" sound. I think that's due to the harder metal.

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S, J.R. Brown
2000 G500 LWB Obsedian Black
2005 Toyota Tacoma Access Cab Off Road Sport
1993 Volvo 240 Sedan Anthracite
1980 450SEL Champange (owned it for 15 years. Great car)
1986 280GE LWB Anthracite (Sold it and kinda wish I hadn't)