IMHO, there's no substitute for a good dyno tune. I'd find out where a good dyno wrench is near you and call the cat up that does the tune and see what he likes. The guy that does mine prefers SERT/SEST and he doesn't sell them (but he does sell PC products). If you can find a good, honest wrench they'll not steer ya wrong.

I don't like going with the SERT becease it gets mated to the bike which I think is a BS move on Harley's part but whatever. I'll end up dropping the coin on my next bike for it as well probably as long as Bobby is still doing the tunes.