Welcome to the site :cool:
Be sure and go to your User CP and update information relating to your location, type of riding, etc. After that grab a spot on the couch and tell us a bit about yourself.
As far as bikes go, go with what is comfortable. Who cares if it is too small. If you are comfortable, enjoy it. If you outgrow it, you can upgrade. I got a KTM 400 on the belief that I "should" be on a 4 stroke after many years of being away from bikes. I tore my foot up pretty bad as a result and was on crutches for 2 months. My fault, my problem, but I kept the bike. Now I have 8 to choose among. :cool:
BTW - I have a ttr125 with a 150 kit on it and it is FUN!!!! My daughter rides it, but I am betting she takes my 200 from me soon.
Again, welcome to the site and shout if you have any questions!