Upgrading to T13

What are the guidelines for upgrading to T13 and breaking our T12 set bonuses?

Is it worth breaking our strong, throughput 4p T12 bonus in order to gain another longevity bonus in 2p T13? Should I instead wait until I can get the 4p bonus?

How does raid finder tier gear fit in?

The int upgrade is huge. It does suck to lose an amazing 4pc, but the overall stat upgrade does even it out. As for raid finder gear, I wouldn't wouldn't worry about wearing it until you gain 4pc for a sheer increase in stats if you are using normal T12.

If you are grabbing normal t13, then I would go to 2pc first without dropping any T12 to ruin the 4pc. The 2pc is nice mainly because of how much damage floats around in DS. If you end up working in Hardmode, you'll definitely want to grab ahold of the 2pc T13.

What if I have heroic T12 at all but helm? Sorry I realize I should have specified.

http://us.battle.net/wow/en/character/mannoroth/Sunnymuffins/advanced

The stat increase is still good. I know I want to grab the 2pc T13 while I have full Heroic T12. The fights in DS are insane for healers right now. Anything to get mana back or save it is extremely helpful right now.