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This really depends upon the manufacturer and model of your scooter, but a 150 cc scooter will generally top out at about 60-65 mph. The cheaper Chinese models will only do about 50-55 mph, while good Hondas will go up to 65 mph. I had an 86 Honda Elite 150 scooter, and it would do about 63 mph with me on it.
The $9000 Bergman 650 will cruise at 80 mph and can go as fast as 110 mph. However if you really want to go that fast, you'll get better handling out of a motorcycle and it will probably be cheaper. The Kawasaki Ninja 650R has a price of $6500 and a top speed of 138 mph.