It depends on what you're going for. Sterling is a Saaz offshoot with spicy noble-type character, so it would pair well with other American noble-type offshoots like Crystal, Mt Hood, or Liberty. Or since you're making APA, you could try it with something like a mid AA/mid intensity hop like Mandarina Bavaria, Cascade, Azacca, or Ahtanum (to name a few). I would definitely NOT blend it with something strong like Citra, Simcoe, Mosaic, etc., or the Sterling would get lost.