The Yuba Combi costs about £1000 while its ebike equivalent is the Combi E5 costs around £3100. Am I better off getting a specialist to convert the Yuba Combi with a conversion kit and save myself a load of cash. I need an ebike to lug a 7 year old but £3100 is more than I can afford. If the conversion is with Bosch Performance Line I will have a better motor than the Yuba Combi E5's shimano steps E5000 motor that the Combi E5 comes with?