You will find a lot of info here on this subject. First decide on whether you want to keep the cat. If you do, get slip ons. If you want to get rid of it, then full exhaust is what you will want to get. Rinehart gets my vote
You need to decide if you want to keep the cat--as previously stated. If you like the stock look, but want to get rid of the cat, then go to Fullsac Performance and buy the X pipe. Looks stock, but with big performance gains. You can also have them change out the baffles in the stock mufflers if you like the look or go for slip-ons. And of the previously mentioned solutions works as well--depends on what you want to spend also.
Screaming Eagle.......designed by the people who designed your bike. When combined with the SE intake and download (Stage 1), the overall performance is flawless w/o any aftermarket tweaking on a dyno. Did it to the last 3 bikes and was 100% satisfied with the performance.
I'll jump on the fatcat bandwagon. It's a quality built exhaust and has great performance to boot. That's my exhaust choice regardless of the model it's going on.