I prefer the binary Quad mags if your track will let you run them. Some of the Epic X's are good and some are dogs. I hear the Mystery motor is a good 12 scale motor but have not tried or dynoed one. If you can look at them out of package try to find the one with the least amount of drill balancing on the arm, this usually means thaat the wire is wound a little more consistant and generally they work a little better.
"we need to do at least 11.2 km/s to break earths orbit or almost the speed as Cam's car"
Neil Armstrong 1968