you could cut the nozzles on the mj's, thus making the ouput greater as well as a wider discharge. find some way to turn it on/off regularly or randomly (timer, controller such as aquacontroller jr., reefkeeper...) each time the pump cycles back on it will likely be pushing water in the other direction. a great way to introduce some chaotic yet changing water flow.
but if you have the money, get a controllable tunze 6000. you can wait on the controller, and i really would get a multicontroller, more capabilites