Induction cooktops and cast iron go together beautifully, so I'm told. For that reason, I looked into an induction cooktop a while back but wound up so mesmerized by my desire for things like this: Garland GI-SH/WO 3500 Countertop Induction Wok Range 3500W that I eventually gave up on the idea completely and just continue to use my old electric coil unit.Induction cooking, uses magnetic force to cook with and cast iron is as good as it gets...
After all, that unit is special purpose (although if I had to cook everything in a wok, I could) and bumping up close to $2K. It's possible to spend nearly $12K on a single station: Dinex DX1011208 Countertop Induction Heating System, 208v/3
When I find myself trying to justify purchases like that I (usually, luckily) snap out of it and just walk away from the whole subject. If I ever build a new house, though, there will be some mighty expensive induction cooking units in the kitchen.