I know I am a little late but I thought I would share my experience. I started out not to long ago with an antec H2O 620 for my CPU, It worked fine and with the right set of fans it was very quiet. I decided to go for a custom CPU loop and found some good prices on used fittings, pump and res. I got everything I needed for a CPU loop and got it up and running for less than $150. I soon found myself wanting to try new things like different tubing, different res, larger radiator, and the list goes on. Now I am sitting on several unused parts, loads of tubing that I have not used yet, extra fittings and on and on and on. I recently did an audit on all the spending I have done in the last year, over $2,000. This all started by wanting to try a CPU only water loop. I am totally addicted to water cooling now and am even thinking of changing my system again, even though I just spent $200 on copper pipe just last month. Moral of the story, you will get addicted and spend way more then you initially think.