Originally Posted by Zaspera
Also, what is the difference between compression fittings and barbs?
Compression fittings have a sleeve that slides over the tubing and screws into a barb. They are mainly for looks, don't waste the money unless that's what you are after.
Decide what kind of fans/how much noise you want your loop to make before selecting a rad, as they are made for one type of fan or the other, fast or slow.
Also, is all of this going into your Haf X? Google images of watercooled cases like your own for the best ideas. The Haf isn't great for multiple rads.