If you are getting an induction cooktop, why do you also need a gas rangetop? Especially since you'd need to use propane?

cpartist - we can foresee times when we would want the option to have both. We cook extensively, and have dreamed of a gas cooktop for ages (absolutely hated our electric range in our last home). Propane is the only option for the gas rangetop, as we will be living out in farm country and there are no gas lines anywhere nearby :-). We also cook a ton of pasta, love that the induction wouldn't heat up the kitchen as much, and love that it would be safer to use when cooking with kids. It's a splurge to get both, but something we really want to do.

With 2 cooking products, your ventilation needs will more than double, and you may need a quasi commercial setup with one large 8' hood over the whole zone. You haven't factored that into your selections, nor the make up air that it will require. That's another 10-20K, depending on your location and whether or not your locality will require heated makeup air.

Would that be required even if both cooktops were not being used at the same time?

With respect to propane, your post reminded me of this recent Yale Appliance blog post, which talks a little about conversion kits and power loss: http://blog.yaleappliance.com/best-30-inch-rangetops

I don't really understand how you could ever need 10 burners, but it's not my kitchen! You do need to think hard about ventilation, though. It's going to be very expensive.

I have to agree with Green Designs. Save the propane for your grill outdoors. And with young kids, do you really want to have propane around? I don't know. Propane scares the willies out of me.

Or another alternative if you are dead set on installing a gas rangetop is a plug in portable induction unit. This would allow you to pull it out when making pasta or hosting parties. These won't have the performance of a built in unit, but an option. http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=Portable+induction+ If I was buying one, I would splurge on a hospitality grade one.

MIL has the 48 inch Wolf Rangetop with integrated griddle that runs on propane. I honestly prefer the cooking performance of my Bluestar

I have the Electrolux Wave Touch ovens. Do I use half the buttons, no, but it's an amazing oven and I'm really happy with it fwiw. But, if you like the other Kitchen Aid appliances you may be able to purchase a suite and receive a discount. So, the KA oven may be better for you.

These guys aren't joking on venting. I was shocked when remodeling to learn how much vents cost.

There is a laundry forum, you may get more feedback on the whirlpool machines there. HTH

Love my Thermador 36" Range...the star burners are the best. I have to echo people, that you don't need both gas and induction. I would have loved induction, but alas we were getting a range and DH is a chef and would have scratched the glass on the induction the 1st second he used it.

>>>"Would that be required even if both cooktops were not being used at the same time?"<<<

If we are talking make-up-air systems, then the answer is that the MUA system has to be sized to maximum possible usage. That's true if your area has codes or regulations that require MUA, but it is also true under the laws of physics as well. MUA might or might not be very expensive. The cost will depends on what you will have in your new house (e.g. propane water heater and furnace? fireplaces?), on how your house is laid out, on your local climate, and what your local regulators say/require. With you having kids in the house, it is definitely something to check out.

>>> "between the migraine * * * and the food allergies/intolerances that I have ..." <<<

I think I've seen reports that some folks with migraines seem to be sensitive to propane. Might want to research this if you have not already done so.