If I was you I wouldn't choose for the DD Cube (it has a high pressure drop - it's completely 3/8" copper tube).
If you want a small rad go for the BeCool AquaCoil II or HWLabs Black Ice.
My favourite is the AquaCoil (see roundup at
http://www.procooling.com/reviews/ht..._1_-_8.shtml), although the one tested in this roundup is the old version without the 1/2" connections.
CD
