I went with the HOB filters simply for aesthetics. Now that there is a book shelf on the living room side of the tank, I may consider a canister. I have one sitting in reserve, just in case I decide to make that change.
Surprisingly, the flow in the tank is pretty good. Having the two 55g rated HOB filters on each side, really moves the water around. I definitely need to get a better powerhead (Teresa wants her back:p)
Unfortunately, I don't think a sump is viable where the tank sits. Hiding that would be a project in itself:p