Motor and ESC I use in Drumroll:

http://www.ebay.co.uk/itm/Scorpion-HK-4 ... 4ab6a39910

http://www.ebay.co.uk/itm/RC-Car-Brushl ... 3a7c6bd9d1

The ESC is really good value for money, although it was only £69 when I bought it last year. Likewise, the Scorpion motor was £85 when I got it, seems to have shot up quite a bit now though.

You can get cheaper alternatives (try HobbyKing) but I couldn't say how the cheaper/lesser known brands compare to each other.