Thanks for the info.
When I last checked capacity was low on the LAX-SEA-NRT route so I should be able to select seats for my friends and I that have power outlets.
Even though LAX-NRT direct would be the most convenient I think we may opt for the SEA-NRT A330 if it's a better coach product in terms of comfort and IFE.
Just hoping the fare remains the same between now and the time we book the flight in the next week or so.