If you have the ST 2500--then do it. If you don't have an engine yet, then put a small gasser in it. You can even use some of the really small weedies like the Featherlite 18cc and 21cc engines with a glow plug and glow fuel. Or, you can do what I like to call a hybrid where you mix 2 gallons of glow to 1 gallon of gas and still use a glow plug. No ignition, no magneto, no coil. Just prime it--put the glow igniter on it and flip it.

I prefer gas though. I'm trying to get away from glow as much as possible. You can do a Ryobi 31 on magneto ignition for about $140. Put a C&H on it, like I did, and your engine costs about $200.