I got mine from Jared at Lethal performance for 1165.00 shipped to my door. They are a sponsor on another site and they give you like 10% off when you mention that site's name.
I had a friend come over and help me do the install. It went pretty good I think it took us about 8-9 hours but If I had to do it again it wouldn't take that long. As far as your cats go they wont work with L/T's I put on JBA's H-pipe with high flow cats.
I would sya either Kooks or JBA. I just installed JBA Titanium coated L/T's on my car and everything fit very nice. The coating helps to keep the heat down.
What he said^^^. Welcome and Thanks for joining our crew. There is always something going on here and there is a lot of shows and get together's being planned so if you get some time you should check out the Calendar. What kind of car do you have?
lol Good luck with that. It is hard to get anything for the stock exhaust. I have a manifold back setup with 4k miles or less on it and I would never get that kind of $ for it. If you get it let me know.