I demolished all of LFR this week after picking up 4/5 of the 458 set. Gave up almost 1k spirit but my mana management became way easier. I can't remember what my overheal numbers were, but Illuminated Healing and Beacon were my #1 and 2 spells.
Of course, this was LFR (couldn't make it to my weekly 10man), so take all this with a grain of salt. But, having 33% more Eternal Flames is pretty insane no matter where you are. Don't forget that DP procs also give you +1HP, instead of just being "free".
Oh, and I couldn't figure out if I was better off using Tower of Radiance or Holy Radiance for extra HP while Shock is on cooldown. Or if that's too inefficient, and I should Holy/Divine Light non-Beacon targets to get the heal sharing rather than HP.