Scott,
I live in Mount Vernon, so the Skagit, Sauk, and Stilly are the rivers I fish most often. Juro is correct about the 14 ft 9 or 9/10 being a little on the big side for the Stilly summer run fishing after the river drops to its summer low (sometime in early July most years). However, I very effectively fished the Stilly all summer and into the fall with a 14 ft 9/10 rod for several years until I bought a rod expressly for summer/fall fishing (it is a 13 ft 8/9). In fact, during April, May, June I like to use a 15 ft rod on the Stilly. I even used my 14 ft 9wt on the upper Sky, and it is a smaller river than the Stilly. Like I said before, a 14 ft 9wt is not the best rod for all situations; however, it is the best compromise rod for use year round here in Puget Sound.
I still recommend a 14 ft 9 or 9/10 rod as the best choice for an all-around one for year round fishing. Sometime is the future you can look into getting a rod specifically for summer runs and a third rod for winter fishing. You will still find uses for the 14 ft 9 or 9/10 wt though even after you get the other two rods. There is a plethora of quality 14 ft 9 or 9/10 wt rods on the market and they cover the complete range of actions from slow to fast. All of the rod models that have been mentioned will do the job as an all-around rod. They all have very different actions and feel though. That is why several of us have recommended you go see Aaron and cast 4 or 5 of them before plunking down your hard-earned cash.