Rating depends on what you'll be fishing for. A medium-light rod rated 8-12 will work for pinks, hatchery steelhead, and smaller coho. A medium-heavy rod can be taxed by chums and kings and big coho.
A rod rated for 8-15 or 8-17 will handle most river fisheries. It might be a little stout for pinks, and it might be a little under-gunned for kings, but it'll do as a do-it-all rod.