I would wait on the Wp40. It is unknown how long they last. Mine lasted just a few months and then crapped out. The manufacturer also did not honor the warranty.
Hydor Koralias have a good guarantee and have proven to work well. The wave maker is unnecessary.
I would use at least 2 x 850 gph
, but if this will be a reef tank, probably more like 2 x 1200-1400gph.