Keep in mind, too, that you can choose to bid to reserve to get the days off you want (I.E. Weekends) rather than a line working weekends. If you live in base close enough to sit at home on a 2 hour call-out, it's not a bad way to keep the wife happy at home because you'll be at home as much, if not more than you would be as a line holder with minimum days off. Lots more driving to/from the airport, but if that's your priority you should be able to get that when you get even somewhat reasonable seniority on reserve (probably 90% in base, but I'm shooting from the hip).

If you plan on living more than two hours away from SEA or doing an easy commute, then obviously being a line holder will likely be better than reserve. Just giving you another option depending on where exactly you plan on moving.