V star 250 from Yamaha.

But, at your height and weight why not take a motorcycle safety course. They use 250s. Learn the basics by falling off their bike.

I believe you are big enough to handle the Bonneville if you know the basics and go slowly for a few months.

Remember, there are two kinds of riders. Those that have fallen over and those that are about to.

Ride safe, good luck.

I try to aggravate one person a day. Today may be your day.