I was just getting ready to post something else regarding the Kitchenaid 42" built-in french door fridge. It's offering 22 cu ft, I think, but I'm not finding any reviews on it. Maybe it's so new that it doesn't have any. They offer it in SS and custom panel.

By limiting yourself to 36" wide and counter depth, you have put a lot of limitations on your choices. If you look at it, the only thing you have not specified is the height. Add in bottom freezer (the least common configuration) and you have really limited your field.

If you take you available dimensions (3' x 2' x 7' (height)), then subtract 3" on each side for insulation, you end up with 24.375 cubic feet. Subtract space for the motor, compressor, evaporator, condenser, etc., and you come up with around 20 cubic feet available.

KA has a 25 cu ft counter depth, but it is side by side and taller than most. Other than that, you are in the 20-21 ft range.