I would make seio one of your lower options for movement, especially in a large tank. Tunze are the best (but you have to pay for the best), but Hydor do some pretty good powerheads that are cheaper.
The Tunze, Hydor and Seio are better than most other powerheads as they send out a wide stream of water movement, rather than a needle like jet.
If you want real current, splash out on a Tunze Wavebox. This moves all the water in the aquarium from one side to the other and back to create waves. On full strength it can move the water level by 50mm at a time.
By creating the currents that the corals need you will be creating conditions closer to that experienced by life on the reef, so will not be greatly affecting other creatures. Just be wary of placing softer corals directly in the flow of jets of water.