Budget wise, we bought the nicest basic range at Lowes that didn’t have a bunch of extra gizmos. We thought convection was just one more thing to break and most models above the one we bought were convection or larger than the opening in the counter (standard 30”). Their weren’t any purely mechanical ones on the floor.
I wouldn’t be opposed to paying more if we could be confident it would work reliably.
https://products.geappliances.com/appliance/gea-specs/JGB635DEKWW
If you're electronic-adverse, GE has an even more basic version of this oven with no electronic oven controls, but ironically costs more than the above oven:
https://products.geappliances.com/appliance/gea-specs/JGB450DEKWW