Skagit, Skagit, and more Skagit. 20lb Steel very real possibility, 30lb lotto fish are there. 20+ coho are there, dont let the 3 lb Cascade fish fool you. 50+ Kings are there too, but need to be released like the Steelhead.

Ive been lucky enough to hit all three, and trust me when it comes to the big ones its all about luck. I dont care how good you are.
I say the Skagit but you could get any one of those lunkers in about any river.
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"I have a fair idea of what to expect from the river, and usually, because I fish it that way, the river gives me approximately what I expect of it. But sooner or later something always comes up to change the set of my ways..."
- Roderick Haig-Brown