Well, the TSP duals are affordable, and there's a million people on here using them with great results. If you're like me, and wanted a real muffler on your duals and not a glorified straight pipe, then fabbing your own might be the best choice for you, as long as your decent with a mig welder. My home grown dumped true dual setup consisted of:
Summit universal 3" X pipe kit
(2) Magnaflow stainless mufflers
(3) good exhaust hangers
time, patience, and a little know-how with the welder
Overall the cost was under 300 bucks and I couldn't be happier with the sound, performance, and fit of it.