-the i5 3570k is much better than the fx. if you are getting fx, id suggest waiting for the 8350.
-look for 1600mhz ram. the gskill ares 1600mhz is only 34.99 after MIR
-get at least a 7870. a 6670 looks stupid with a 200 dollar chip
-get 1 hard drive rather than 3. if its just 3 random ones that you already have, go ahead.
While I'm not sure whether or not they can provide the connectors you need (though I can't imagine they wouldn't), from a quality standpoint the Corsairs jemm recommended are some of the best you can get for under 50 pounds. The other I'd recommend would be this XFX PRO450W.