Kitting a Vespa 90?

Hello all,
Ive got a question about kitting my Vespa 90. Has anyone out there done it, and which kit is the most reliable. Im not looking for a rocket, just something with a bit more „umph!“
Even though Ive had my scoot for 4 years now, Im still a bit in the dark
[I)] when it comes to performance mods, and most other topics. I would like to have a well mannered, great handling scoot. [:D] At the moment, she`s pretty much original, minus turn signals, white-wall tires and two-tone paint. If there are any other suggestions as to handling/performance for my 90 (short of getting another scooter![[:O]]), please let me know.