Buy the Speedmaster. I'm an oldster, bought a BSA new in the 60's. Loved it, my bud had a Bonny, loved it too. Just bought an '06 Speedmaster a few months ago. No problems, even after I dropped it like a big dummy. Not a scratch on it, had to tighen the mirror. And because I am old, and don't like noise so much anymore, I like the quiet from the stock mufflers. The attention it gets is great too. As far as power, I'm 6'1", weigh in around 300; it goes faster faster than I want to go. (no, that wasn't a typo) A sweet scoot. I bought after only sitting on it. I made a great choice. And all these great people on this site can help you and will help you with every problem or question you can come up with. Now that is the best reason to buy one!
You'll love it!