There is a reason that almost every site that sells Danner pumps also sells replacement inlet/outlet housings. That is because aquarium userse too have experienced the same problems everyone else has with these and that is breakage.
Here is a link to a message board that experienced reef/aquarium users discuss water pumps and which ones they are using.
It is a great read since these are guys who have been using water pumps for years and since most of us (including myself) know very little about their reliability and performance.
http://www.reefcentral.com/vbulletin...001/12/2/49580
They mention alot about pumps that are probably too powerful for pc watercooling. However, alot of them mention using Ehiem's which are in the same power category as Mag Drives. Sad to say not once in this long discussion did anyone even mention or suggest using a mag drive. Either way, if you want to see what these guys are using, read up. I know I learned alot.