I'm not saying that there isn't anything better, I'm just saying that I'd try the MM motor. When you say hot, how hot do you mean?

Just keep it under 190 or so. It is a cheap motor. If you want something better for the MM, look at this Lehner 1920/7 at three times the price of a MM motor or the Lehner Basic 4200 at twice the price. The 1920 should make for a nice motor that will run cooler. If you want to get stupid, maybe the 1930, but I don't think I've seen that done in a 1/10 scale before.