well you might be cool for the first five minute riding a busa but more honestly you should get a 600 or a 750 unless you wana be a good organ donor
I've been riding since I was 14 in my country and when I turn 16 I start to get into street and track racing with a cagiva mitto 125cc 2 stroke like these

as you can see they are perfect replica of ducati 998.
anyway these bikes were maxed out at 110mph and even tho I had two years of experience on 80cc speedbike and supermoto, I still had some moment where I was shitting bricks on narrow roads.
First you need to get use to the feeling of riding a bike at regular traffic speed for at least a good month minimum. get good balance, try dry and wet road and understand the physics. then if you get a chance take it on a race track like moroso to see how far you can go.
Once you get there you are pretty much done and can go all out.
remember that a 600 already get you up to 160 and driving at this speed is totally different that riding a bike.
now you might think what I'm saying is being a pussy a fag or whatever, but a lot of people will tell you the same. you're gona do nothing but hurt yourself if you go for a 1300cc right away.
I've seen some of my friends stay at the hospital for more than a month for some BS so all I can say is, think wise, watch for cars and enjoy riding.
I'm myself getting back into it so hopefully before the end of this year I should have two wheels again.
hope this could help