Mario Batlli has his own line of enameled cast iron, but I don't know who actually makes it for him. Pretty handsome stuff, from what I've seen.

There's also Chasseur, which is a somewhat lesser expensive line of enameled cast iron. I do not know about its quality. I have both Staub and Le Creuset and love them both.

I would suggest that you go to the home site of the different lines to see if they mention suitability for smooth electric cooktops. If they don't, you could probably e-mail or call the company.

Here is a link that might be useful: chasseur