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Now more precise analysis.
Assumptions: BoL active, no librams (to take them into account one has to do a spreadsheet), holy build (thus extra 5% holy crit, 12% healed, illlumination). I will take into account T6 bonus, since there is no need for haste on sub-mid T6 lvl.
Let us call the amounts of buffed +healing H, non holy spell crit - C (25% => C=0.25), haste rating - Hs. I assume than you spam HL11 each 2 sec (a bit unrealistic and shifts the result into higher haste area, but we should start somewhere and it will give us some estimate). I will try to answer the question, how much +haste you will need to let HL10 catch HL11 in HPS, assuming HL11 gets crit, equivalent to haste for HL10. And how much mana you would save in both cases. The answer x (in rating units) can be found by solving an equation:
(1+(x+Hs)/1570)(1840+580+H*5/7)*1.12*(1+0.5*(C+0.11))=(1+Hs/1570)(2321+580+H*5/7)*1.12*(1+0.5*(C+0.11+x/2210))
that will give us the following monstrous formula:
x = [481*(1.055+0.5*C)*(1+Hs/1570)]/[(2380+H*5/7)*(1.055+0.5*C)/1570-(1+Hs/1570)*(2861+H*6/7)/4420]
Example: for 2450 +healing, 20% spell crit and 131 haste rating variable x=330. That means that adding 330 haste rating to your current HL10 you would get the same HPS by non stop spam as by adding 330 crit rating to your current HL11. In the first case you would save 265 mana per 5 sec (crit taken into account already), in the second case you would save you 188 mp5.
So, going for haste instead of crit you both save more mana due to downranking and get additional benefit of increasing max possible HPS (HL11 spam). (a bit counterintuitive result, isn't it?)
I have to mention that this result is valid for a good geared paladin. For paladin with low values of H, Hs, C going for crit could be a better option. I will check if it's true, though I would need to use some mathematic software I guess.
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