I am looking to get my first street bike. I do not want a 250 for sure. Nothing bigger than a 650. I want to know what the most appropriate size and what bike exactly may be the best. Considering lack of experience, cost repair, mileage, age. This will be just for cruising around, no tricks or racing. I am 5´10´´, 145lbs., bear in mind I´m a pretty strong female. Any suggestions would be helpful. Thanx!