no dps healing is really ever going to be worth it, especially if you get to the non casual side of endgame, you will hear a lot of times "don't stop your dps its too important, let the healers rez and heal" rdm and smn rez is for emergencies, such as healer down or out of mana.

you're not going to find a class like wow pally that can full heal the grp while being top dps and tanking (unless you play warrior)
best bet is find something that feels fun to play, if you haven't, try MCH, it lacks healing and rez, but its a good class to learn stuff on, easier rotation with a lot of interaction, everyone will say SMN and DNC because they are the de-facto throw a new player on these jobs, but you will also run in to 20 of them for every other class you see, same as WAR tanks and SAM melee dps.. healers do seems to diversify a bit better for new players, granted 90% of the healers toolkit is the same no matter what one you play.

pick what looks cool and fun to you.