At our program I encourage all 9 of our teams to always use the andymark neverest motors for two reasons. One they come with the andymark power poles installed already which are directly compatible with the modern robotics modules. Two because they have built in encoders that work very well and are the easiest way to program a reliable autonomous.
We also switched from tamiya connectors on the batteries to Anderson power poles. If you have the funding, I highly recommend it. Just be careful to not accidentally invert the polarity or you will burn out your power distribution.
Motors and Wires:
http://www.andymark.com/NeveRest-s/550.htm