as some of the above posters have added already, don't confuse "random flow" with a "wave" I've used both methods. IMO you don't want the Tunze Wavebox. I had one and sold it within a week. Even the nano wavebox is BIG. It DOES make a very nice wave, but a standing wave just sloshes water back and forth with very little actual current. What it DOES do is keep crap off your rockwork by keeping it suspended in the water and so you can filter it out.
The other method wont provide a "wave" so to speak, but will be more valuable to your corals IMO. I think flow is one of the most overlooked aspects of our tanks. You're going to want a flow that is as B R O A D as possible. The vortechs I have to a great job of this. It isn't REALLY REALLY STRONG, but it is really really broad and moves a LOT of water around in the tank.
In summary, I would advise against the wave box, and go with a flow oriented approach. Just my to cents.
B