When I was buying my bike, I was considering some entry level bike like M600. May of my friends told me that buy a bigger bike straight from the start, because the power of small bike might leave you little cold after a while.
If you got balls enough to control your own head and wrist it really doesn't matter if you have some extra power.
I was in the situation that I wanted to have a bike that I could hold on a longer time, cause I dont have the $$$ to change it after first year.
So I got my first bike, Ducati Monster 900Sie and I have not regretted that.
If the bike doesn't make you face hurt because your smiling all the time riding it, it just might not be the right for you...