I feel your pain. XD
I just bought dispel a few weeks ago from the Jeuno AH for 69k. I got lucky, I know. I don't think I can complain too much though...I've heard the WHM spell Erase is MUCH more expensive...like 340k or so. As for phalanx, I figure since it is much more of a solo spell I will hold off for now.
Good luck with the farming and whatnot, though. Send me a /tell in game some time, I love talking to fellow RDM's, especially those that are around my level.