While I agree with the rest of this, fluidized is not quiet unless you have done some serious dampening on your stand lol
I am currently in the process of redoing mine so that I can try and get it quiet, right now I can hear it almost anywhere in the house.
But I would agree, cadillac of sumps IMO would be Fluidized kaldnes. Practically no maintenance, as long as you get the mechanical filtration part done correctly.