You can change your graphics card cooler?
Well, you can change it to watercooled, but they come with different ones when you buy them.
Like, is it an NVIDIA branded cooler? or is it ASUS or MSI etc.
Also, 780 prices seem to have dropped, not sure if it's the UK only, but I saw a Zotac 780 for £320. (just under 400 EURO according to google.)