I rode my buddies R1 for a little bit and yeah, that thing is jet engine, rocket ship fast! My R6 is close, but the R1 is just plain out scary.Well, I started on a honda elite 80cc scooter, Although I rode dirtbikes a little the scoot was my first road bike. BTW riding dirt does in fact give you a hell of a lot of experiance on two wheels, but You should still start small. After the scoot, I got a ninja 250, which in my opinion is the best starter bike ever made! I rode that for 1 1/2 years then I got the bright Idea that I wanted a big bike. I was looking at 600/750 katanas and then I saw an ad in the local paper, 2003 Yamaha R1 $4000 must sell. I called him and jewed him down to $3500 cause he was desperate. I was only 18 when I bought it, and looking back on it, I CANNOT BELIEVE MY PARENTS LET ME BUY IT! I acted like a total jackass on that thing. I actually considered myself to be uber-responsible but that bike brought the worst out of me. I never dropped any of those bikes at speed or stopped (came close though). If I could go back though, I would have just bought a katana 600 and moved up slowly.
Sorry for the long post, the point is that you will actually be happier in the long run by moving up slowly. You greatly increase your chance of survival and it will enhance the overall experiance.
After having the speed of the R1, everything else is just a dissapointment.