It's already perfect!
If you just had to have a new scoot, and were thinking of becoming fashion-conscious (perish the thought!) you could buy another perfect bike, like an SV650 or maybe an Interceptor if you're feeling rich.
Alternately, you could get custom paint: have the Connie done up like a Klingon Bird-of-Prey (green and rust). Then the creaking and groaning might seem more natural; plus, the two are about the same size.
Seriously, i know a guy who got slip-ons and jet kit for his connie from Dale Walker (holeshot.com). It certainly sounds better, insofar as it now sounds like a bike instead of a malnourished sewing machine. They have dyno charts and everything on their site. I think Ivan makes a jet kit for the bike, and Staintune makes cans, but don't quote me on those.
You can get some good performance for the money, but Buz is right, the design is just old. So even opening the cans up still leaves the carb bodies too small and the headers likewise too narrow a diameter. Plus, she's no lightweight. I'd do end-cans (staintune if available, for maintenance puposes) and a stage I kit. Also, I'd do the suspension. Anything more, and you're throwing good money after bad.