Tune my 50 or get a 125 scooter

Hello guys I'm just wondering is it worth tuning my 50cc zip or spend the money on a 125cc scooter. If so what scooter or what parts? And what sort of speeds do 125s go? I had a yzfr 125 and that did 103 mph I'm guessing the scooters do at least 60?

 

Typhoon 125 or gilera runner 125 2 stroke will easily do 100...... kmh and tbh id go for 125 and 172 it