Explain the motors?

[Trick440]

Anyone care to explain the brushless motors?

I'm looking for a motor to go with a Quark 125b and 4800mAh Li-Po 2S2P.

Will be used for bashing. Dirt, grass, and some street.

From what little I have read it looks like the Neu 1512 2.5d/f @ 2000kv is what I might need. (its outta stock) What else should I consider?

And am I gonna need a fan for my controller or anything?