Originally Posted by
rubberbands
I would't really judge who's right or wrong but I wouldnt consider taking IF away as a must. 2k mana off the bat is by no means small. Mathematically it also you good bang for your buck (1 talent point) considering its boosting 3x4 ticks.
Ultimately read and consider what's been said so far and experiment abit. You will need awhile to find out what works for you, your raid and playstyle.
Holy is pretty much the most hotly debated spec, partly since its abit bloated and partly because its a healing spec. You will pretty much find arguments for each and every tier of this tree (except maybe tier 9 and tier 10 on the talent tree obviously)
Good general rule of thumb though:
Turn off recount, at least during midfights
Forget this stat called "HPS". The best way to improve your HPS is to ask your raid to stand in fires.
Understand what you need to do is work on your technique, addons and communication with raid, not competing with other healers.