Mixing and matching appliances is pretty commonplace. But if you're going to stack two different brands one on top of the other, I'd take a good look at the door handles and the finishes on each to make sure they look "of a piece". Everyone's stainless is a bit different as is the thickness/style of the door handles. You might also consider Dacor ovens; they make great products in a similar price range and you could do an oven stack that is from the same brand.

• Frankly, at this level of appliance $$$$$ decision, you should have a good PRO KD on board and advising you.

Sub zero will run you more than Miele so no savings there. As for the stacking of different ovens try to go to an actual store to see what it will look like.

Did you check to see if either brand offered a package discount? We got 10% off Bosch by ordering 3 appliances. That saved us quite a bit.