I have a pump that i think is HIGLY underrated....
look at the RIO brand pumps, mine is Rio 2100
Rio 2100 has 670GPH 8ft head and only 25W which is almost 1/2 of the energy usage of Mag3 pump.
Besides, it will do as good or better than a mag3 in the average computer setup. Basically if you have lots of blocks, gpu, nb, or lots of tubing and kinks go with MAG3, if you have just a cpu block go with Rio 2100
and yeah that pump on ebay puts way too much heat in the water to be worth it, not very efficient, i wouldnt get it.