Live NE of DCA within driving distance of PHL. That's where the European w/b flying will be.

1200 seniority is a junior 777 CA *OR* very nice 777 FO seniority. Trips are good enough that you can cute from
anywhere in the US to fly the 'dozing for dollars' for man trips (2-3x per month).

Have a buddy at an airline sit down with you and show you year by year what different seniority numbers fly. Retiring at 4000 vs 1200 means you spend about twice as long in each of the junior seats and the 4000 guy tops out as a junior (50%?) CA while the guy that retires at 1200 would have the junior years replaced by senior 777/787 FO, senior n/b CA, and junior 777/787 CA time *IF* he chooses. If he doesn't choose that he'd have years of getting every single holiday and summer vacations off as a senior n/b FO.

The seniority gives you options.