I use a 10 inch high pressure banjo burner for all 3 burners on my bruits 10 clone, I have tried using cast iron burners with mixed results (still have them in the shed)and seen other brewers use different types of jet burners with less than wanted performance. The cast iron burners make a good hot flame but they concentrate the flame way to much in the center and seemed to burn the mash and burn the wort in the boil kettle, the jet burners are either on or off and smoke below full on. My banjo burners burn very clean and are fully adjustable from barley on to full on and do not smoke,they are pretty close to the same diameter as the bottom of my kegs and zero burn areas, and you need to use a adjustable high pressure regulator with them and I also use needle valves to control the flame. i would never use anything else but my banjo burners from now on and the cost I paid about $45.00 each locally and I seem to get more use from a tank of propane over the cast iron burners. I will put my system against any system in my home town for ease of use and adjustability of system to meet any type of mash or boil regime.
http://bayouclassicdepot.com/kab4_banjo_burner.htm 
