How much +healing is worth 1% spell crit chance?

A simple question, I know the value changes with your gear (the more healing gear you have, the more each crit chance is worth), but I would like to know how much +healing 1% spell crit is worth in various periods of endgame (pre-raid, MC/Onyx, BWL, AQ, Naxx).
I know it's a bit harder to calculate this for paladins because we get back 100% mana when we crit, making spell crit much more valuable to us than to, say, druids or priests.
Looking forward to answers from some experienced pallies.
I know it's a bit harder to calculate this for paladins because we get back 100% mana when we crit, making spell crit much more valuable to us than to, say, druids or priests.
Looking forward to answers from some experienced pallies.
