Arctic Cooling make some very nice products. They have been a real player in CPU cooling and GPU cooling with their Acceler coolers being some of the best and quietest coolers on the market. They have innovated further and on May 29th they plan to release the first self contained air and water combination cooler for GPUs called the Accelero Hybrid.
The specs are impressive.
It will be interesting to see how well this actually performs. Perhaps a review will be up on Vortez not long after release.