I use a Wake2K in my 75. Pushes enough flow to keep the rock clean, the corals swaying nicely, the SPS happy, and gives the fish something to play in (the current). I couldn't imagine NOT having one now that I have it.
I so also run a Koralia 3 and 4 just to cause more random chaotic flow but that's just me. The Wave2K could do the job very well by itself.