SLC is a very senior place, USUALLY, but that being said there were, as Truckdriver said, newhires on the 767 put there, along with some 738 drivers. I don't think it would take long to bid there at all depending on what plane you choose(MD90 is easiest, then 73N and then 767). If you live in SEA a good choice may be LAX--where there will be a junior 738 (73N) base, along with the 757/767 domestic base(fairly junior), and a new 767ER base (the 757/767 doing Hawaii, Guatamala, and maybe Paris via SLC) that will be moderately senior. The key with SEA is the amount of flights to LAX--via Alaska Air, United, and Delta Connection (Expressjet). If you get the 738 in LAX there are bound to be a lot of Allnighters (BOS, JAX, RDU, CHM, some FLA), and those are commutable probably.
The SLC to SEA commute is not easy (I have a friend doing it), but both Southwest and Delta do fly the route. Just make sure you have a backup if you do it. Same with the LAX--SLC commute. Delta, Southwest, and United (SkyWest) fly that route. If you are a Delta pilot you can reserve the jumpseat on Delta mainline ahead of time for travel to or from work and even personal travel, regardless of your seniority (whomever calls in first gets the jumpseat, not based on seniority). Good luck.
Bye Bye--General Lee