Check out
http://www.pololu.com for motors, they have a bunch of metal gear motors of all sizes and RPM's. They also sell the TRex motor controller to control two motors, in a tank style setup.
Another common controller is the Sabertooth motor controller from
https://www.dimensionengineering.com/
A good site for parts is
http://www.robotshop.com. They also have a Canadian website.
Robot shop has Firgelli actuators to control the buckets and lift arms, a bunch of servo's, and tons of other electronics.
If you are on a budget and have no time deadline,
http://www.hobbyking.com has lots of R/C components for cheap.