If all you're caring about is raw throughput (the OPs original intent), then yes SP > Haste by a substantial margin. Mostly that's caused by massive SP coefficients. If Holy is given haste scaling on Renew this would change (and quick), but the very, very high SP scaling makes SP as a healer very strong.Originally Posted by Worshaka
Haste is a bit better than SP for GH, primarily, while being close to useless on PoM and CoH and only marginally useful on Renew and FH and still good for PoH. You can contribute the worth of your main filler to PoM and CoH, however, when GCD locked.
Looking at GH with the 2/5+3/3 setup and you'll find that Haste is ~25% better than SP. With a 5/5+3/3 setup it's down around 17%. PoH is different because the total SP contribution, rather than ~187% is now over 250%. CoH gets up to 200%, PoM gets in excess of 300%. Renew is at 188%(+28%).
You can work out the numbers for each, then the balance of your healing, etc, but unless you're casting a lot of GH then Haste loses. Haste is vital to Holy though, don't get me wrong. The issue here was this: The OP was trying to lay out a plan for the highest throughput you could get as Holy. SP is better for this and cheaper on gear, but the OP encouraged SP/Haste, Haste and Haste/Spi. The result would only benefit a couple spells which are low on the throughput scale compared to those which scale much better with SP.
Either way, if you read my other posts you'll note I actually encourage Haste and Int balances as Holy due to function, rather than throughput. In real raids the scale factor differences aren't as important and typically regen is the best route to go due to sustainable throughput.