I could certainly be wrong but from the sound of your post you sound like someone who has "aspired" to have a SubZero fridge not necessarily for a functional reason but to have the brand. It sounds as if you're going all out - two Miele dishwashers, etc. - so why not just go for the SZ? If you think about all the people who have been keeping their food chilled without investing in SZ, there has to be something people "value" about SZ other than it's functional ability to keep food chilled or frozen that would make them pay the premimum price. Could be appearance, appeal of saying you have the brand, etc. In any case if you want one and want to spend the $ go for it. It seems you can count on repairs with any brand these days - kind of like luxury auto brands. Just because you spend alot doesn't mean it will be trouble free.

I'm going to jump into this rabbit hole by relating my, ultimately positive experiences. When I bought my Long Island 1895 house, its original electrical service was 30A 110V panel with 4 15A fuses to a small number of circuits. It had been replaced with a 60A, 240V service (again with fuses) and several more circuits run, including one for an electric clothes dryer, a hot water heater, and a room air conditioner (the only circuit with Romex). Like the OP, I decided I needed more circuits, and would prefer a breaker box rather than a fuse box. I investigated having a new service run with new meter and put in a 200A breaker box myself but the restrictions were so great, I gave up on that idea. I would have had the POCO come and pull the breaker (a 2 week wait for that service), the install my new meter pan and panel, have it inspected (another 2-4 week wait), then have the POCO put in the new meter. I couldn't deal with all those delays, so I decided to go the "subpanel" route: I purchased a 40 slot load center and mounted it next to the old fuse box. I then ran 4 Ga wires from the old fuse box to the new breaker box and started moving circuits. When I had finished moving all the old circuits, I essentially abandoned the old box, using only the 60A cartridge fuses as primary protection. Finally I called a licensed electrician come in and replace the meter pan, meter, and reconnect the new panel. It took him about 2 hours to accomplish all that. While I was operating my new panel from the old 60A service, I never blew the main breaker. But that's understandable, since I had essentially no high current appliances, especially after I replaced my clothes dryer and domestic hot water heater with gas appliances. So I accomplished my original goal: more breakers to run more services, but not use significantly more power. On a side note, there was only one 15A circuit for the entire second floor; that must have been left over from the original wiring. Very difficult to run new wiring from the basement to the second floor, so I managed to run 3/4" EMT from the basement to the third floor (attic) and put in a 50A subpanel there, and run all the necessary lighting and receptacle circuits circuits from it. End of rabbit hole!

Many guys hate GE. I think they are fine. I like the layout of things and I think they are decent quality. Breakers are proprietary, but Culter CL Series "classifed" fit. Sq D HOM Series, I like the layout of things and I think they are good quality. Breakers are proprietary, but Culter CL Series "classifed" fit. Cutler BR series is my go to, but not nearly my favorite. Fit and finish is not top quality and I don't like the neutral bar layout. They are simply what my supply house stock and there are more of them around here than others. C-H CH Series is very good quality, but are much more expensive and I don't see too many of them. Breakers are proprietary. Sq D QO Series is very good quality, but are much more expensive. I do see quite a few of them, mostly older. Breakers are proprietary. I absolutely HATE the neutral/ground bar layout. This is s last resort panel for me. I really like Siemens, with a copper buss. More expensive, but great quality. I love the neutral bar layout. Hard to find around here though.

This may not be what you're thinking, but just so you know, in most areas it's illegal for rental property owners to perform their own electrical work. (As a property owner, I know this well.) You'll probably need to hire an electrician to do this wiring for you.