I recommend making your own spraybars. It is easy and cheap to do if you have a local hardware store. Just buy some 1/2" or so diameter pvc piping, some end caps, and that's it.
You can drill holes in the pvp piping, or just do like I did and use a saw to cut notches into the pipe which makes the water spray in lovely fan-shaped spouts.
Fitting the piping to the powerheads is a little more tricky. I didn't use any sort of glue. The powerhead spouts were larger in diameter than my piping, so I just whittled them down with a kife until they fit very snugly into the piping.
You can get really creative with your spraybar layout as well, but keep in mind that every 90 degree elbow you use drastically lowers the efficiency of the flow. I used no elbows at all and only put one 170gph powerhead per length of pipe. I even have piping in my rockwork that circulates the water all through the tank.