Honda cbr230m. My buddy just bought one and it's a lot of fun. Tops out around 75. Good handling and super easy to ride. I used to do motoX and this was cake to hop on and take for a spin for me. Make sure you keep a car though. Biking in the rain blows.
Good call. If you've never ridden a motorcycle before in your life don't go over a 600. It'll scare you at first. The K lyrics problem with that is after a month or two and getting comfortable you'll want more. If you really want a bike get your license and rent a couple different bikes to find your style. Despite what the hipsters say Harleys aren't bad. They ride nice but are over priced.