I had my first 600cc session, loved it, got my mod 1 next week now.
So I've spent the day sitting on bikes in dealerships, eliminated the Honda Rebel from my shortist of 2, but added another 7! Quite like the Adventure bikes now, thought they would be too tall, but having sat on a few mid sized ones, they are very comfy, and I can easily get my feet down.
Naked bikes: Kawasaki Z650, Yamaha MT-07, Suzuki SV650, Honda CB650F
Adventure Bikes: Kawasaki Versys 650, Yamaha Tracer 700, Suzuki V-STROM 650
and of course the Kawasaki Vulcan S
Going to need a lot of test rides to decide, but having so many I shouldn't have too hard a job finding a good 2nd hand example. Insurance seems to range from £350 to £500 so not a deciding factor.