You know what, you guys are right. I am totally out to lunch. Please ignore my previous post.
For sure, buy the 1200 and, as it is underpowered, you will want to immediately jet and install an aftermarket exhaust. I would also recommend the 1216 kit as well while you are at it. I would leave the nitrous to later though. You know, perhaps really you would be better off to just go and buy the ZX-14 from Kawasaki to start and next year when the new Hayabusa comes out, you'll get a good trade in. By that time you'll have the experinece you need under your belt.[/sarcasam]
It amazes me that the most reasonable person here is the original poster asking the question. Read his last post to see what I mean.
Brianjonesphoto, buy the used B6, have more fun than you can ever imagine. It is comfortable and will have tons of power to put a grin on your face. Take a course, as you have indicated, and learn all you can about riding. I am impressed you are looking at good gear.
Sometime in the future, after you have some mileage under your belt, start thinking about the type of riding you do. Once you know your riding style, you'll know what bike is right for you.