When I was taking the class, I too thought I wanted a 250 to start with.. I thought it would be the an easy way to get use to riding, I could handle the weight, it was comfortable etc... etc....
BUT, after about 2-3 weeks of riding a 250, I'd be bored and looking for another bike w/ more power and one that will allow me to keep with Z. The America was a PERFECT first bike for me.