I was going to buy another GTX 580 3GB from bagman (Who bought the other from BennyboyUK) I then was looking at keeping them long term (Due to nothing but rehashes coming out this yeah), so I was looking at waterblocks.
As these cards are non ref, trying to source 3 waterblocks, was going to be a pain, and was going to cost double in shipping due to buying from multiple places.
So I weighed it up, and thought "this is going to be a waste of money investing that much into waterblocks now." So that's why I decided to get something that is future proof, and will hold it's value long term.