I'm have a rough idea on a build that I'm thinking of doing but need help deciphering brushless motors. Originally I thought, the bigger the number of KV the stronger the motor. Not always the case. So can someone explain to me how to determine what's better? Reason for my question is everyone says Castle Creations. They seem to be fantastic motors but are the most expensive I've found. Can anyone help?

Truck its going on will be: E-Maxx 3905

**Also secondary question: I'm buying the Spektrum DX 2.0 after my wifes birthday at the end of the month. If I run two esc's and program them together with the remote will I have any issues? Or what is recommended to do this... Thanks a lot!!!!!!!