I am still a newbie but have to give my .02. :D
I've been using the Hagan Aquaclear powerheads for about 8 months and they run as smooth as a baby's butt. I also have a maxijet 1200 on my Aqua C and it has performed flawlessly. I'm getting ready to hook up my sump and got a mag1200 for the return pump because I've heard nothing but good about those.