You didn't specify new vs. used, or a price range. That leaves the field wide open.

For a UJM, a Honda 750 Nighthawk is a nice bike. About 65HP - the 650 Virago has 35, if I recall. Low maintenance - it has hydraulic lifters and shaft drive. Not very fast for a 750, but sure fast enough.

The SV650 comes in two flavors - plain old naked SV650 and quasi-sportbike SV650S. The latter has lower clipon handlebars and a half fairing. The former has higher bars and no wind protection.

If you want a sport-tourer, consider Kawasaki's ZX-6E/ZZR-600. It was made from 1993-2004. (The current ZZR-600 is a different bike.) It's large for a 600, comfortable, smooth, has good power, and a reasonable 30" seat height.

That's all thats coming to mind at the moment.

- JimY