Actually, "Blink" is a really good one to jump in on, because it basically has nothing to do with the rest of season 3. Seasons 2 and 3 have both had a "Doctor-lite" episode because shooting schedules meant the Doctor and his companion couldn't be around for most of one episode, and "Blink" was S3's "Doctor-lite" ep. Which means it's not part of any story arc at all, plus it focuses on different one-shot characters...and unlike "Love & Monsters," S2's Doctor-lite ep, "Blink" is actually really fantastic on its own merits. Also scary, because I have never looked at a statue the same way again since watching it.