DO NOT BUY A GAS OVEN THAT IS NOT SELF-CLEANING. I have a Viking (bought in 1996) that has a gas convection oven. The oven is horrible to clean.
The cooktop, however, cleans up in my kitchen sink.
My next range will be dual fuel: electric convection oven, gas cooktop. I don't bake pastries much either, but I do roast meat, bake casseroles and other savory dishes. In other words, foods that spatter. I need a self-cleaning oven.