those are the ones thatr were on sale at mitre 10 arent they? i went through a couple of these, they are really rattley. if you are on a budget, then the via-aqua powerheads are pretty sweet, about $40 for a 1300lph one, $90 for a 2600lph one. i have both types as in-tank circulation and they have gone fine for years. if you want something a bit gruntier, the seio ones from petplanet are good. if you want to pay the price of a small car, then have a look for some tunze streams - most people end up with one or more of these in their marine tanks. they move huge amounts of water.