In reply to Rowie B: Got to agree with dave's comment. Buy the best you can afford, try and get the bent gates with the largest possible opening, the DMM Eclipse are great for that, then try and get some with various lenth slings, a couple 25cm, same with 20cm and then the rest 10-15cm long.
Depending on what routes you climb I would say that 10 quickdraws will be about as many as you need but that will obviously depend on whether you use single or half ropes.
As you get more profficient at leading routes you are able to cut down the size of rack you carry on single pitch routes, for me though on multi pitch routes I dont think you can really go overboard with the ammount of gear you carry its better to carry too much than leave yourself short.