OK, I am biased, but the perfect bike for kicking around town is an older BMW. I prefer the /2s for this--like a mid 60s R69S (pictured). They are fun, reliable, and easy to work on.
If you don't want to spend as much money get a /5 or /7- mid to late 70s. Reliable, easy parts availability, and fun. They make a great restoration project also if you enjoy doing that.
