Culing Cube is an excellent radiator. Combined with the Eheim 1048 pump, it will surely be enough for cooling the 152W peltier with no problem. I recommend you to use the MAZE2 waterblock from Dangerden as well. Although it's little pricey, it provides better cooling(not significantly though) and better install on mobo. (Uses 4 holes around the CPU socket.) I'm using the Cooling cube, MAZE2 block and Danner 500GPH currently but going back to Eheim 1048 due to noise. Eheim 1048 is almost noiseless.