Thank you for the help you have all given me already.
Right i have decided to try build a featherweight robot but i need some help selecting components. im trying to build it abit on the cheap side but not so cheap that its full of crappy components. would have loved to find eveything all ready to run all in one place and it just needs fixing into a chassis and connecting some radio gear but its impossible i looked everywhere. anyways here are a few things i need abit of help with.
what drive Motors and gearboxes are the best to use and whats the best way to go about having 4 drive wheels if i decide to do that?
what sort of speed controller would i need?
what is the best battery to go for if i do have it with 2 or 4 drive wheels?
I may also be going for a vertical spinning weapon approx 120 dia, so what kind of motor will i need for that?
then its just the radio gear. if i got a 4ch futaba kit that should do me just fine right?
if you guys have any links that my help or links to ebay where i can find the stuff i need that would be very helpful. can you think of anything else i might need?

Cheers.