i need a new project

[Patrick]

1515 2.5D (1700kv) is a good motor for 5s, can be geared up for high speeds and is petty good on 6s. I like 5s on the 2.5D for the track, low temps, low power draw, and you can play with gearing a fair bit. Haven't had any problems with my quark since using this motor (no mods on the quark).
I don't think you'll need a $375 MGM. The $275 16018 should be enough for the track and normal bashing and can still do 6s.
I don't know if you'd need mech brakes, unless you want them. I use motor brakes in mine. So one less servo to buy. I thought most of Mike's motor mounts don't work with mech brakes any way, but I haven't looked into that.