My 02 SAN uses the Rule Aerator pumps. The system works well other than the obvious never enough weight thing. My only problem is that the fill and empty do all three, so no tweaking which is needed in that boat.
The system has seperate through hulls for each of the three fill pumps. There is a ball valve between each through hull and the aerator. It's pretty fast aside from the extra bags to fill, but we may replace the rear hard tanks with larger bags anyway. We also have a bag that sits on the bow seats.
The aerators are pretty reliable, no impellers, and are cheap to replace. Do like troy said if you go this route, use the rocker switches and you can tweak the rear sacks for a nicer wake.