I've already got an Noctua Owl air cooling system which kicks ass.
I was really asking if any of those components could be replaced for cheaper options. It's mainly a gaming build but I do a fair amount of blu ray encoding os that's why I've opted fot the i5 over a bulldozer or other popular AMD processor
Thanks a bunch mate. I think £700 is the bare minimum I'm going to get this system for.
One last thing, I hear that the i5 2500K has better overclocking capabilities than thei5 3570k.
Should i get the 2500k and save myself £20?
I would go with the 3570 because it has PCIe 3.0 bus and it does have slightly higher performance even with the same clock speeds but if you want to save the cash, either one will be fine and like you said, if you are really OC'ing heavily, go with the 2500k.