Ebuyer - 2 RMAs with them, went off so smoothly, they try to guarantee a 3 day turn around on receipt of the RMA and they did for me. Scan.co.uk - never dealt with their RMA service, but they have a support forum over at Hexus with active staff and they seem to bend over backwards to help people. Those are the 2 retailers I use almost exclusively for components in general For cooling specific products - thecoolingshop and chilledpc.co.uk