Have you considered Alaska? For most of your routes if you fly AA you can credit those miles to AS and get both elite qualification and redeemable miles. Also, miles from DL, NW and CO can be accrued in AS's mileage plan however CO will not count towards EQM. You can redeem miles on AA, BA, CO, DL, NW, QF etc. (List of AS partners here)

As the OP never mentioned status as being important I don't think it would matter that she (assumption mine) wouldn't be flying AS metal very often although AS and AA do have a couple of flights between SFO and LAX and there is always the option of flying to the east coast xSEA.

What the OP did state as being important in her choice of FF programs were:
-no miles expiration
AS still has a 2 year activity requirement where most have gone to 18 months. Also, AS doesn't charge the fees others do for domestic award tickets - even on partners.
-500 points earn minimum, not actual miles flown
AS still offers this this for both AS and parner segments and given the number of AS/QX (Horizon) routes they fly that are less than 500 miles I don't think this will change anytime soon.
-no luggage fees
AS still doesn't charge for the first checked bag and there are no plans to do so. A second bag is $25.

Given AS's relationship with both OneWorld and SkyTeam members while not aligning itself with either gives the OP, in my opinion, the most flexibility both earning and redeeming given her travel patterns.