HPals are solid at 20. Censure is more of a bonus utility for Holy, dotting rogues especially.
Shaman is also good at 20 and 22. There are some nice new items at 22 that offset the stats you lose from scaling (Shield of Uncurbed Appetite, Yorgen's Boon, Silver-Lined Belt etc). Frost Shock is great, not quite as gamebreaking as dispel for Druids/Priests though. 20 Shaman is perfectly viable, but if you're just looking to avoid Gnomer I'd go with 22.
So yeah, 20 HPal, 20 RShaman and 22 RShaman are all solid options.