Big Chief, sorry , I don't have any experience with any of the gas ovens, I just know that gas can put out a tremendous amount of heat. Another option to consider if you are a tinkerer, and on a budget, is to pick up a used 2 deck stone unit ( Bakers Pride, Bakers Partner, or similar ) , and upgrade the electrics. To do that, you would need new heavier gauge high temp wiring, high temp connectors, new elements, new cord, new switch, and new thermostats, and new indicator lights. Depending on how high you wanted to go on temps, you might be able to do the conversion for under a few hundred dollars. For example, you can get capillary thermostats for under $15 that go up to 300C - 572F that handle up to 16 amps http://www.ebay.com/itm/Electric-Oven-50-300-Celsius-N-C-Capillary-Thermostat-Temperature-Controller-/230878479270?pt=LH_DefaultDomain_0&hash=item35c16e03a6
and you can find elements that would give you a lot more watts per inch than the ovens came with standard,and depending on the size , wattage and shape, the costs aren't that high. I am in the process of buying the parts to convert an electric pizza oven that I have, though it will take me a few more weeks to sort out the parts and do the wiring, I am shooting for 5.8 watts below the stone, and 7.8 watts per square inch above the stone. The up side is that if you are pretty good with electrics, you can put a separate thermostat for each element. Of course, you need to be careful when working with electricity, and you don't want to ever go to a higher temp than the oven was originally designed.