This seems like an ideal time to reference the research done by Davis Hsu on the Green Bay model of player management that was posted at Field Gulls a while back.
Basically, it outlined the idea that with few exceptions, the Packers don't bother with FA and instead reward their own FAs according to the following general philosophy:
1/3 (One-third) - or more importantly - 18 - which is the closest number to 1/3 of a 53 man roster. Green Bay rewards 1/3 of its roster with big money 2nd contracts - typically players in Year 5-8 of their careers (peak) and about four more Legacy type players (Year 9+).
2/3 (two-thirds) - Or more importantly - 35- which is the closest number to 2/3 of a 53 man roster. Green Bay is able to always pay its best players, and never lose the players they want to another bidder, because 2/3 of the roster is cheap, young labor playing on inexpensive rookie contracts.
13 - or perhaps you can think of it as 1/4 - This is the number of new players that enter the Green Bay system each year.
So there are your stars that you reward with lucrative contracts, your role players who tend to be on cheap rookie deals, and a steady influx of new players to compete for jobs.
We are about to hit the point in PC/JS's tenure where guys who came in and were beloved because they were building blocks in turning our team's fortunes around are going to start leaving - either because they were offered a better deal in FA or because they get beat out by fresh blood from the draft. It's not going to be comfortable, but it should allow Seattle to sustain an excellent team for a long time.
So who would our 18 "stars" be?
First off, consider those guys who are already on that 2nd deal: Rice, Harvin, Bryant, Mebane, Miller, Clemons, Lynch, Unger. That's 8.
You could add in Okung and Thomas as guys who got big rookie deals and will be priorities to re-sign. That brings it to 10.
Then the guys who are currently on cheap deals but will be top priority to re-sign before they hit the market: Wilson, Sherman. That's 12.
Who are the other 6 that we would include in that list?