[5String43]

I'd think you'd want something small and light, like a dual-purpose bike or something. Honda makes a pair, and which one you might choose would depend on how big you are and how much you want to spend. One's the very well-known XR650L, which has been around a long time, and the other is the CRF230L. These are both simple, relatively light, and a blast to ride.

I would not recommend a Kawasaki KLR ("Killer") 650. They're relatively heavy and hard to handle, in my experience.

Ducati Monster? Wonderful beasts! During my seven-year term at Cycle World I did the initial road test on that bike and have loved them ever since - I've owned a string of Ducks. But as much as I love Ducatis, I don't think that's a good bike for someone relearning. Like any sportbike, they're fast and they'll make you believe you're indestructable. Which clearly none of us is.

Most important, though, please, please do take a Motorcycle Safety Foundation riding course once you get your bike. And remember that every single automobile and truck driver is a homicidal maniac who looking for you.