I like your idea of specing into pie later.. I might try that >:D
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honestly, like someone mentioned before there is no exact preference for a BiS, because all of the stats can be useless at any given time. I personally believe there is a BiS that's found somewhere in the middle of all SS and Crit.
From my personal experience with WHM, there is a threshold for SS that you should overcome, as for exact numbers I don't have the entire gear set to state but what it basically feels like is, you have the ability to pop the important heal quick enough. Once you reach that point, you start lowering your SS till, it no longer feels like that and middle-ball that. It feels somewhere in the 460+ range. That's when Crit becomes the more viable stat. I value Crit slightly better then determination but only if you can get you crit over 13% chance which is roughly about 450+ crit. I aimed for a 300 determination, closer to hitting 288 though.