Well I just went through turnover for my 110gal. I guess the best possible setup would be a closed loop with a wave unit.
I myself did not go with that option because I did not want to wait or did not have the motivation to build the closed loop system. Which really is'nt difficult at all. But I went ahead and purchased 2-1100 gph SEIO powerheads. which is giving me 29x turnover with my sump return.
Anyways, maybe I will switch to closed loop later down the line when I upgrade to 300+ gallon HEE HEE