Since you already have the YS I would stick with that. Once tuned they hold their tune really well. Initial costs of an E setup is fairly high but a good plug and play setup would be the Himax 6330-210 pro motor with a Castle Creations HV 80 amp speed control. You would want at least 3 sets of batteries. Most guys run dual 5 sell batteries of 4200 to 5200 mah. For a glow conversion I have found you really need the weight of the larger batteries. Here is my latest glow to E power conversion. An old Chip Hyde Hydeaway. Power is an AXI 5330 F3A motor with an OS HC1100 controller and Falcon 19x13.5 prop.

a side note on prop selection with your YS powered Icepoint, the 140 what tuned well will idle down quite nicely. You shouldn't really have an issue with slowing the airplane down. To a certain degree CG can influence landing speed just as much as idle speed.