Well, you said that you really want a 2-1 setup. In that case, I highly recommend what I have... The Drago's Bike Works S/C/S-4 2-1 exhaust. You have a SERGU, so you can get away with just the pipe. It's about $650, made by Rush... and is excellent quality, performance, and sound. I got the left side ghost pipe, too, because of my stretched bags and rear fascia. It's another $315.
2-1 pipes are generally targeted for race-type applications... high-HP high-RPM stuff... and so they work best with higher duration cams, such as the SE 259e cams that I run. 2-1-2 pipes will generally provide much better low end torque than 2-1 pipes with lower duration cams such as the SE 255 cams that come stock, or medium duration cams such as the Andrews 54H cams.
The Fullsac X-pipe is the best thing going for a 2-1-2 pipe. Fullsac baffles aren't the loudest around, but they sound good and will perform very well. I had the Fullsac system before I went to the Drago's 2-1 pipe. Many of my friends run the Fullsac and they all like it.
I like the TTS MasterTune because it offers more tuning flexibility and functional support than anything else out there.
Ken