I played RDM and WHM at 75 in FFXI. WHM is just downright useful wherever you go. If you want to get into the really awesome fun endgame stuff, being useful to a good end game crew is the way to go. ;)
CNJ seems interestingly balanced, too. No melee soloing for us like for WHM in FFXI from Lv.1-5, we get exclusive access to damage spells using the wind and earth elementals. Kind of interesting, and I suspect that CNJ will end up being a lot more than just a healer in the long run, especially since it seems they've done away with RDM and split its former role up between the existing disciples of magic classes.
Dusk Sanatore (CNJ, FSH, GSM) @ Cactuar
Dusk D'norte (MRD) @ Kujata