Im considerning the same thing. I'm gonna take advantage of the RAF gift levels and roll with the priest for now, and then gift as many levels as I can to different healer classes. Shaman is a good option, excellent class for rounding out edges (self rez rocks too). Druid can be a useful addition too. HoTs means you can run around and still heal, battlrez can save a wipe, and can off tank in bear form if your paladin dies.