A 500 wouldn't be a bad bike but if you really want to be a great rider, get something you can throw around easily.  You're a small guy, so that's gonna limit you.  Once you've mastered a smaller bike, move up to a bigger bike.   You are a prime example of why I think the U.S. should have a graduated license program like they have overseas.  I dont say this to put you down.  When you get your bike, the DTC will cum over and ride with you.  I promise you that you will be exhausted after a very short time and your ass is gonna be killing you   And the DTC is a relaxed riding group.  Are you fucking serious?  STFU!!