Question about haste for resto druids

Rolling 5 LBs takes about 170 Spell Haste at 0 latency. The amount of +Healing or Regen that you lose in reaching that number isn't nearly worth what you'd get from rolling a 5th LB stack.
The ZA neck is the 2nd best Resto neck in the game and arguably 1st if you don't care about Stamina, simply because of it's high +Healing in conjunction with Spirit. The ZA cloak isn't as good as either Prince's cloak or the PvP Badge cloak though.
Most of the top ranked items have Spell Haste because our Sunwell gear has Spell Haste on it. Even without the Spell Haste they would still be our best pieces.
Spell Haste is really only valuable in Sunwell, where a good deal of Regrowth casting is necessary to combat the massive raid damage and also because our +Healing begins to hit diminishing returns. For anything else, an equal amount of +Healing would be better than Spell Haste.-This is my Druid, there are many like him, but this one is mine.So I switched to Resto about a month ago since I had no luck in Kara getting feral drops, but managed to accumulate quite a bit of resto gear. Anyway, I've been to the Loot Rank links from the EJ Tree forums, and I noticed that many of the top pieces have spell haste. Now I know that haste is great once it allows you to start using 5 LB cycles instead of 4, but when does that happen? I've read various things that say that you have to take into account your latency, but I'm not entirely sure how to work that into your calculation. If it helps, my latency typically ranges from 150 to 250ms depending on the night.
At what point does it start to make sense for me to stack haste over other stats? I'm specifically referring to the neck and cloak out of ZA, as I don't have access to anything beyond the first few bosses in SSC and TK.
Thanks in advance,

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