Size wise you can't go wrong with an R9 of some description. As Kerry said it's only going to go as fast as you ride it and you strike me as being reasonably level headed, better to end up with something that's going to fulfil all your riding needs for a few years as opposed to something that gets to feel too small too quickly.

https://www.bmw-motorrad.co.uk/en/mo...ninetpure.html

In your position the pure would be my choice.