The hydro copper is designed to use water (liquid) cooling. You would need a liquid cooling resevoir, a radiator, and pump. If you wanted to also cool the CPU you would need a water circulating heatsink for the CPU. If you are nervous about liquid cooling this is not for you.
Isnt everybody a bit nervous to start out;). I have been building air cooled quiet PCs for years so its only the electricity/water thing that gets me thinking. For just the GPU are there any kits you recommend?