You're not gonna be able to get the cat-back part of the system too easily if you want to do a bolt on true dual exhaust system. You could go with something fairly cheap for headers such as summit's headers, but personally if you're gonna do it.. do it right and get stainless, which becomes much more difficult to find.
I went with a cat-back system however and chose a flowmaster system. I certainly regretted it. Not loud enough, the stainless steel was rusting, and the customer service was less than desirable at times (excellent at other times I must say though)
If you want something not too loud though, the flowmaster sadly might be the only thing to fit the bill. I think the magnaflow system has a muffler that is too quiet.
I'd really recommend the magnaflow 14" muffler. That's what I went with in the end of my exhaust nightmares and I'm really happy with it.