Em:
Like you I am 5'9", but a bit over your 12.5 stone fighting weight. With a 30" inseam, I can cast my leg over the bike with ease. I can sit at a traffic light with both feet flat and pull the kickstand back easily when parked. I have also managed to pull the bike upright the two times I spilled (operator error).
I bought mine in 02, the first year they came out, and 32 thousand miles later, it is still the best bike I have ever ridden.
If you decide to get one, the members on this forum are great and will help you out with your questions. They do it for me frequently.
Ted
Oh, I'm 55 and had a hip replacement 2 years ago.