I just bought a new 2012 Zuma 125. I don't know about top speed, but it should be around 60 mph. I only have 12 miles on it so far, I will find out soon enough. I bought Japanese because I traded a crotch rocket in on it (probably saved my life). But the Agility 125 is just as good, cheaper, just not quite a fancy looking. If money were a major issue, I would have no problem at all buying a Kymco scooter. They are NOT typical Chinese JUNK. I saw a video where an Agility 125 ran off and left a Vino 125, and I know a Vino 125 will do 55, and that is with my 220 pounds on it.
One thing to remember about these small scooters that top out at 55-60 on flat roads with no wind. Just the slightest headwind or an uphill grade that you can't even see can slow them down considerably. Nevertheless, I have put over 2000 miles on my Vino 125 on the freeway without problems, even though it is technically illegal.
2002 Vulcan 750, 2001 XT225
2008 Vino 125, 2009 Genuine Stella
2012 Zuma 125, 1980 Puch Newport moped