Solar/200A+ service upgrade in California question

Existing 100A service and main panel from PG&E here in California.

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Planning for a future detatched ADU to be built potentially years down the road. What I’m going to do now is relocate the service to a new pole in the backyard, and replace the single meter with a dual-meter panel. What I’m trying to figure out is whether to go 200A and have only 100A for the existing house and 100A for the future house, or go >200A and have whatever capacity I’ll realistically need for a 10kW solar system AND the two houses. If I do 200A, the single 100A side will only be able to support a small solar system, so I need to go bigger than 200A I believe.

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This means PG&E will have to increase the size of their service drop, although they say that with no additional load the wire won’t have to be any bigger…for now.

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So, my question for you folks is, what are my options for a dual meter panel greater than 200A, which I assume I’ll have to do in order to accomodate a 100A house, a 10kW solar system, and a future small house.

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Thank you.