To do 80kph+, you'll need an engine size of at least 125cc. However, 125 - 150cc scooters will max out at around 90 - 100kph, depending on how heavy the rider is.
As far as brands are concerned, the scene is kind of similar to cars -- Japanese and Taiwanese scooters are ultra reliable, and Italian scooters are stylish and trendy, but are not as reliable gum law. Vespa, in particular, is very much a boutique brand, and while their scooters look extremely stylish (with that impossible to duplicate European flair), they are certainly on the expensive side as well. Piaggio, which is their value line, is more affordable (but has the same not-Japanese/Taiwanese reliability).
Personally, I really like the Yamaha BWS 125 and the Honda SH150i. Both are fuel injected, and should be tremendously fun to ride. The BWS has smaller but more rugged tires, so it should be more nimble, but would feel a little rubbery (b/c of the taller tire). The SH has big tires, so it'll feel more stable at speed, but is less agile darting around town. Kymco is a very reputable Taiwanese brand, and their scooters would be a little cheaper than the Japanese brands, but I am not as familiar with their scoots.
If you ever want to do I5 / I405 / I90, etc., you'll need at least something with a 250cc engine. I am quite light, so I remember myself doing almost 130kph on a 250cc scoot with a full high speed tuck-in. But you're a bit bigger and heavier than I am, so you might need something a little bigger. I personally find the 400cc+ maxi scooters to be too big and unwieldy, but Vespa and Piaggio have scooters with 280cc engines now, so they should be good enough for Interstate travels should you ever feel like it.
(Personally, I wouldn't do that because I find scooters to be most enjoyable at sub-100kph speeds, but whatever floats your boat, you know?)
-Lik |