Full Intellect except maybe that tear thing or a purple gem for the meta.
At the moment thanks to (in part) all this extra mana I can dominate meters and have a severe impact on the raid healing. I don't get paladins who use FoL so much, seems like a waste of a raidspot to me, spamming HL throughout most of the fight, refreshing beacon and using shock as much as possible too (mainly for the crit, FoL if on the move). I'm not saying I'm an amazing pal or anything, but I can easily go above 6.5k HPS on many fights if I'm left to do as I please, and having 28k mana (not hugely geared yet) really helps.
I'm just defending paladins as potential raid healers here thanks to stacking int. Then of course are the obvious reasons why Int is THE stat... DUH