Your one 'nice' door might make the other two look cheap, so for that reason, I'd go matching.

I myself don't like the "matchy-matchy" look. It says to me that there was more concern for the matching than for the functionality of the appliances. I think there are several reasons to buy non-matching brands in appliances: - The appliance manufacturers all have their strengths and weaknesses, i.e. some make good ovens, but not good dishwashers, and the like. For example, people here rave about the Thermador column fridges - compared to other similar fridges they're winners! Yet the Thermador wallovens are very expensive and have been reported to be problematic. I think there is no consistent brand. - people overly worry about matching the handles. Trust me, no one will notice, including you, whether the handles match or not. - Some brands have more bang for the buck than others. You can see by shopping around, and definitely by checking this forum which brands offer more on an appliance than others; and it varies by appliance, it's not across the board. - Some brands of appliances are just re-badges of more reasonably-priced brands with an upcharge just for the name, but otherwise the same machine. So people who want, e.g., all matching Dacor, will then buy a Dacor microwave for, like, $500, when it's actually just a re-badged Sharp that cost $250. - Builders push the matchy-matchy look. That's because they buy hundreds of appliances in bulk from one manufacturer, so it pays for them to extoll the all-one-brand look. As to your other questions...panelling a fridge. It can be expensive, both for the panels and also there's an upcharge for a "panel-ready" fridge. If you love the look, then it will be worth it for you. That's a personal taste thing. Also, the panels may be easier to keep looking clean than stainless steel doors. Re SxS vs. french door, I would advise you to look through this forum as that decision has been discussed a lot. I find my SxS fridge to have lots of cu. ft. (25), yet I think it's too narrow. If I had to do it again, I'd get a single-door, bottom-freezer fridge, or a 42" or 48" fridge. The french-door fridge is good if you do not have a lot of aisle clearance, but the counter-depth size FD do not have a lot of capacity. Since you will have a 2nd fridge, that won't be an issue. You should go to a good appliance store, and see the various choices in person. Also read this forum thoroughly. Yes, it'll be hours of your time, but the payoff will be worth it in the long run.

Its absolutely fine to go with a different door style. A real colonial/early american 19th c. house often has different doorstyles throughout anyway, ranked on whether the room was "public" or "private", first floor or upper floors, or even by importance in the same room.

I think a black front door and garage door would look great!