Don't convert the electric wall oven! Electric ovens are so much better - the reason that many ranges are sold "dual fuel" is to have a gas cooktop and electric oven. So its not weird at all. Alternatively, have you considered an induction cooktop?

I'd suggest induction too. We love it! You get the control of gas without the expense of converting and with much greater efficiency. Everyone here that has it seems to recommend it, so I did some research and took a leap if faith (we know not a single person that has it locally). It is one of the best decisions we made for the new kitchen! DH spoke of nothing else for almost a week after it was installed, and he -really- wanted gas.

We built our house so we had a blank slate on what we could do. After much research on the benefits of each, we went with a 6 burner gas range top and duel electric convection ovens. There are specific advantages to gas and electric ovens. The ideal in many people's opinion would be to have a gas range w/ gas oven, and an electric wall oven so you could leverage the benefits of each depending on what you are cooking.

I guess that's a long winded way of saying that a gas range and an electric oven are a very fine and logical pairing.

As for induction - also a great choice.

What types of things do you use your oven for? I would not arbitrarily say one is better than the other as it depends on what you are cooking and how the oven is engineered and the features it has. There is nothing wrong with one gas and one electric oven.