You'd probably find enhance shaman rather fun all the way up to 346 blues at 85 (then the OPness start's to fall away a little but until this point you're a forking god).
Go shaman and make at least 1 spec healing, you've done dps on at least 2 characters and if you were smart you tanked as a DK, now try healing with either a melee or ranged dps off-spec choosing the one you like doing the most.