So, I'm not sure if you heard- but wives can sometimes make things interesting. Our stove of the last few years has a warped black porcelain top, coil burners. We use either Stainless (non magnetic) or cast iron cookware. Sometimes big, big pots too. In practical experience, have you used cast iron on smooth glass stoves? She wants ideally to not have the coils anymore, but glass seems like a bad idea. Our last stove had a stainless top and coil burners too. Was the fact it was stainless make it more rigid? No gas available unless we rent a tank. What seems like a better way to go?