Ram electronics also makes a good unit, it comes shrink wrapped with a 1300 ma cell already on the board. About $40 Tower Hobbies has them or their web site is,
www.RamRCandRamTrack.com
I personally don't think it's a good idea to just hook up a couple of cells to the glow plug and let it cook, that can and will burn out the plug at the worst possible time.