3 LED Matrixes, 6 motors, and 3 clocks

Hi all,

I'm looking to get started with Arduino. I'm starting small with the various LED projects, but I'm keeping my eye toward a bigger one that I'm hoping to accomplish.

For this project, I would need to be able to drive 3 RGB LED displays (8x8 or smaller), 6 motors to control some spinning disks that display things and 3 clocks (meaning they each have 2 controllable hands that can independently point to a specified point on a dial).

Can anyone recommend the best place to get cheap components (Adafruit looks like the best but seems quite spendy for each RGB led matrix)? I'd want to keep the total cost as low as possible (of course), even if that means spending some time learning more programming.

Also, what sort of Arduino platform would be the best to build something like this on top of? Cheapest possible (including all the necessary interfaces for the stuff I mentioned above) and having enough memory space to fetch very small amounts of information off the internet.

Thanks all!