I agree with the above post regarding FWM Docks. We've had ours for several years now and couldn't be happier. We've continued to add onto it and have even changed the layout around from what we had originally had.
Before purchasing the dock from FWM my wife and I did a ton of research. We liked the idea of the crank up docks... but it's such an eye sore for almost half of the year. We have a nice view of the lake and couldn't see looking at an erector set. So in the end we really focused our search on a standard aluminum dock. And you really can't beat the FWM Dock in my opinion,
www.fwmdocks.com.