[dhgeyer]

Well, the Kawasaki Ninja comes to mind, but it's not a cruiser, and doesn't have the same riding position as the GZ250. It'll do 90 or better, and, other than getting blown around being so light, will do highway speeds with no problem. Weight is not significantly higher than the GZ.

Hyosung makes the GV250 Aquila, which is a light 250cc cruiser. It's got significantly more power than the GZ250, but not as fast as the Ninja. Don't let the fact that it's Korean throw you - it's a quality machine. It makes 25 hp compared to the GZ's 16. It has a dry weight of 368 pounds, so it's not quite as light as the GZ, but not as heavy as a 500 or 600. I've known several people who have had them, and they are reliable and fairly nicely fitted. Only real drawback there is finding a dealer, or a used one nearby. They're still relatively new to this country.

If you want to stay in the 300 pound range, I can't think of anything currently made that's bigger than 250cc's. But there are faster 250's than the GZ. There used to be a lot of bikes in the 300, 350, and 400 cc range, but that was years ago. Now it's 250 and then 500, and not many 500's.

I would also second what Easy Rider said: in another year or so you might be quite comfortable on a Vulcan 500 LTD, which is a wonderful machine.