That's the exact same bike I had. (Yellow is the fastest color!) For awhile, I had struggled with the same things you are struggling with. I had upgraded the pipes, mirrors, levers, and then oil cooler. My next big upgrades were gonna be suspension for sure - shocks + complete front end. After evaluating my options and adding up the cost, I thought it was better off trading up to a bigger bike altogether. Because I know I would be envious of the dry clutch, bigger motor, and the SSSA. Adding everything up, that's basically a brand new bike.
I am with Raux on this one. Keep it as is and get a 2nd bigger bike that's different in style. But if you obsolutely can't fight off the mod-bug, go with suspension.
