Brushless setups. HELP!

[Finnster]

If you really want max speed, Id go the 1Y on 5S or the 2.5D on 6S (its fine on the MMM, really)

45 is more than plenty for the track, so a 1Y on 4S, a 2.5D on 5S or a 3D on 6S are all good choices. The 3D would be the coolest, but a 2.5D is really good two. Can't go wrong either way.

Also, take the time to learn to solder. Its really quite easy and really needed if you will be using elecs. Its like not knowing how to clean an air filter and running nitro.