Hi Emlyn,
First off, I'm 5'7" (170cm) and I have no problem handling the America. At stops, I am flat footed, and I don't feel like I have to reach for the foot controls when on the way.
I live in Taiwan, we also have a lot of people and crazy-blind-drunk drivers all the time.
Like it was said, just sit on the bikes. They will tell you. I sat on my America and I knew it was for me. I sat on Kawa Vulcans, Honda customs, Yammie VStars and the one that fitted me the best was the America. It felt right, for me. It would be different for anybody else. I also found that a Kawa Z1000 fits me like a glove! I enjoy the Duc Monsters but not the Streetfighter. Each bike has a fit and a feel.
Find the one that is right for you.