Wow! That Mr. Fiddy is beautiful! Is it a restore or original? Is that a rear tire on the front?
You're question is subject to price. Not sure how much ya wanna spend on your pit bike. If price isn't an option, and ya want it street legal, get a Honda Grom. If you want to ride it as a dirt bike, and use it as transpo, then grab up a KLX or CRF 110. If ya ride double with a GF or whatever, ya can't go wrong with an XR/CRF80 or 100. The seats are bigger. Have fun. --L*64