I heard good things about Williamette? I read an article a week or so ago that recommended it for APA/IPA
I almost always use Willamette, Glacier, Crystal, or Mt. Hood in my IPA/APAs along with the more powerhouse hops. Sometimes I get a little metallic taste from Willamette though. The earthy, spicy, and herbal nature of those hops brings some complexity to the style, IMO.
Otherwise, Nugget/Mosaic is a hop combo I quite like, as well as Brewer's Gold/Mosaic. Another one is Pacific Jade/Crystal plus another hop that I throw in while brewing.