I think you and I are having some of the same things to ponder for new builds. I think my use is going to come in at about 10 kWh per day, but may be as low as 6 some days, when in "not using the mini-splits" season. Personally, I'm planning on either Victron or EG4 6000 XP. If I go with the latter (starting to lean that way), I'll go with two of them and may buy a third to keep as a spare, simply because they're not expensive and I learned from the Covid supply shortages (two is one, one is none).
I also have a 12KW generator at the current house and we've never had a problem when using it for days at a time. I think I'll start with 15kwh of batteries, with room to expand up to 45. I can pay for a lot of battery-recharging propane before I equal the cost of an additional battery bank, so am eager to see how we do with our first bank of 15 kwh. BTW, for well pump, check out Grundfos SQ.