Scott,
Some of the basic changes to the airbox and exhaust will really start to wake up your bike...enough to feel it from the saddle and put a smile on your face. Not sure how you ride, but I found the early bike's rev limiter setting of 7,200 rpms to be a real damper on the fun, ending the party way too soon...especially after making upgrades that allow the bike to charge up to the limiter quicker. A common change is to have your ignitor rev limiter raised to somewhere north of 8,000 rpms...or fit an aftermarket ignitor with that feature (along with a few more degrees of ignition advance). Personally, I run an 8,500 rpm rev limit - which has been demonstrated over the years to be perfectly fine for these bikes...keeps me from constantly bumping up on the limiter when I'm feeling frisky.
Enjoy the ride.
Cheers,
--Rich