http://www.tunze.com/usa/en-gb/dept_161.html

It's the 6100 and 6110 that are in the $300 range. I think they're a bit too pricey but I do like that added ability to control the speed.

I've been thinking about getting one or two of the reeftec's which would set me back about $100 for one, but that 6080 model sure is tempting too. I think the reeftec would be better for an alternating current though as I plan on having it switch on and off thoughout the day. (And possibly switching on and off less at night so the water is a bit more calm)