I have a 6ft 180 gallon and have been looking for quite some time. I was about to purchase Vortechs, then a wavebox, but after some discussions, went with two of the Tunze 6105s and two of the Tunze 6055s (controllable nanostreams) with the 7096 multicontroller. I was amazed at the flow they put out and couldn't be happier. My corals also love them. All my SPS has seen increased extension.

You can also get a wave going with just two 6105s inverse to each other. The multi controller 7096 has a function for this.