IMO, there really isn't a substitute for Chinook. It's one of those hops that has its own distinctive vibe. That said, Columbus is one of my favorite hops in general. It forms the backbone of my Pale Ale recipe, and I bitter almost everything with it.
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Secondary: Sour Red, Saison Tarté Noire, Flemish Red A/B, Flemish Oud Pale, Sour Experiment A/B/C/D
Kegged: Summer Spiced Saison, Rakau Pale Ale, Saison d' Tablé, International IPA, Belgian Witbier
Bottled: OaksterDAMN Barleywine, Saison Noire, Royale with Cheese, Awkward Encounter Wild Ale