I prefer to hand flip my 40cc ZDZ, but that's your choice. The Miller/Dynatron combo sounds like a good deal for the price. Now a few of the guys at my club field being using a direct drive Dynatron ($62.99 @ Tower) driven by two 12Volt Lawn Tractor batteries ($19.00 each at WallyWorld) hooked up in series (24Vdc). It reliably starts DA 50's, and ZDZ 50's with no problem. If you want to spend more money the Sullivan Megatron ($159.99 @ Tower) will do it with only a single 12Volt battery.