Hi! I'm a bit of a scrounger so can give you my highly low budget suggestions.

Buy two of these

http://ranglebox.com/product/botbitz-10a-brushed-esc/

and one of these batteries

http://www.componentshop.co.uk/12v-2...tery-pack.html

and one of these chargers

http://www.componentshop.co.uk/intel...ace-packs.html

Job done for fifty quid This is all basic old tech stuff but I use it because it's so cheap and easy to get hold of. You can get posh ESC's, lipo batteries, lipo chargers and all of that carry on but you will hit a hundred quid very very quickly. I have a build thread with all my naff cheap robots on made from biscuit tins, plywood and chopping board that you might find helpful lol. Can also give you some links for bolt on wheel packages cheap if you need it. I'm mostly into beetle and ant weights so can help a bit.