I would go with the cc/Berg receivers check out the CC site www.castlecreations.com for info on the berg rcvrs.

A speed 400 motor is a can type brush motor that is made by Mabuchi and other mfgrs. Most rc flyers have used a 4oo class motor over the years. They are heavy, inefficient, electrically noisy and generally losing favor in the market. However they are inexpensive usually less tha $10US. which accounts for their popularity. Brushless motors are more expensive but have no brushes to wear out nor do they make a lot of rf noise. IMHO avoid the speed 400 brush motors. Get the brushless motor and your life will be easier.

ciao -rjf