I like the gravity setup. That is what im building. I will have one pump to pump my water from my boil kettle to the mash tun. and then from the mash tun to the sparge tank. Then I will use that same pump to pump wort through the chiller plate to my converted 15.5 gallon keg for fermentation. I will then use C02 to pump from the 15.5 gallon fermenter to the Cornelius kegs for slow carb and conditioning.
The first five days after the weekend are always the hardest!