I still have mine, but haven't run them in a while. I can't stand the heat so I stay in the Air Conditioning.
You can use any 370 size motor, like the ones for the RC18 series. The battery packs from the RC18 also work it you change the plugs (mine has Deans plugs). If you need an ESC the Novak Spy is a nice one (my wife has one in her Mini-Quake) but there are many good ones on the market. You don't have to call Megatech unless you want the OEM parts.