If I recall correctly, you're running off of a manifold? If so, I'd do two single reactors instead of a dual. That way you can control flow to each reactor individually, as well as taking one offline without affecting the performance of the other.
With respect to circulation pumps, I'd definitely go WP40, just because of the controlability aspect. You future proof yourself somewhat if you ever decide to start using a reef controller, because the WP40 has flow that you can adjust (even without an apex) using the controller that comes with the pump. With koralias, you just get on/off functionality unless you buy their specific controller.
On to biopellets, they definitely have a pretty big cult following. There is some risk involved, such that you can overdo biopellets and strip your water. BRS makes a cartridge for tumbling BPs which you could also attach to your manifold. And skimmers, well.... You know something is fishy when your wife starts prodding you to buy power tools. Very suspicious....