if your that worried about mana as it is, or not being geared, then you most likely dont belong in ulduar. get geared by running the current heroic raids and youll be just fine in Ulduar.
http://www.wowarmory.com/character-s...oof&n=Sunociva
Edit : after looking at your char alittle, your not that far off the ball. Id ditch some of that MP5 stuff and replace it with haste/crit. And deff. replace those trinkets. . . you should by now be able to pick up egg of emortal essence from the badge vendor. also the PVP pants, bye bye. and the 1-2 blues but thats not a huge deal you are looking decent and should be fine for Ulduar. The set bonuses are pretty good for pally healers, so id look at picking up 2/4 even if it lacks a few specs. . .