Just be careful about parking charges, since seatac is insane with the parking costs, compared to PDX.
Can't wait for the lightrail to be done up here...you guys could catch Amtrak, get off in Tacoma, walk across to the lightrail stop and lightrail it up to seatac.
Well,depending on how many people you have, that might not be as thrifty as it could be for us (if we lived in OR).