WHM will always be my default choice even if I'm frankly rather tired of how it plays now.

When I'm chewing through casual content I'll go as DNC, it seems to strike a good balance of buffing (I was a Shaman in EQ and WoW and a BRD in FFXI) with just enough healing capability to allow me to step up to the plate if the group's healer drops the ball for whatever reason.