if you hit ebay you can get a set inc some vinyl for around 200 pound upwards, depends on how much you want to spend tbh

cd decks start around 100 plus mixer etc so alow 200-300 plus

to kit your self out with top spec stuff you can spend thousnds, mine stands me in around 5000, and still not finished

something like this would get you started

http://cgi.ebay.co.uk/FULL-DJ-SETUP-...ht_1522wt_1165