First of all good choice on choosing a Buell i was the same way in choosing a motorcycle. I have a 2008 xb9sx and it is my first bike and i can say that it was very nice for a begginer bike and i think that i will always be happy with the amount of power. i wish i could tell you the difference between the 9 and the 12 but ive never ridden a 12. but if the price is right then go for it:D:D:D