Piaggio 70cc barrels, which one?

Hi all, I'm looking at 70cc kit for a project and would like some input on which one to get? It's either the DR or NGF iron kit or the Doppler s7r ally kit? It's down to one these or what do you think's best? (around £100) I'll be using atop racing evo crank. What exhuast? Pedmoto, Doppler, Yasuni?