Elitist Jerks' Arcane compendium has this to say:
Intellect is by far the strongest stat, followed by hit although you still have to be mindful of the hit cap. The relative values of Crit, Haste and Mastery can vary a great deal, dependant on gear and raid buffs. The problem with a table of relative stat values is they are typically treated as a mantra set in stone rather than a guide. Tools such as Rawr and SimC are ideal for determining your relative stat values better than any static table.
Don't know how out of date it is, though. Skimming the guide a bit and I'll see what I see.
With the Patch 4.1 reduction in the AB cast time and given the levels of Haste present on current raid gear, it is now once again feasible to encounter the game mechanic of the Haste Cap; where under stacked spell haste conditions (such as Heroism/Bloodlust/Berserking) your AB cast time hits the 1 second GCD hard limit. Current analysis indicates that excess Haste be reforged to Hit or Mastery as required. Tools such as Rawr can calculate this for you if your appropriate raid buffs and spell haste effects are set correctly.
It sounds like the answer will likely remain a mystery without opening up some simulators. Edited, Jun 28th 2011 1:19pm by Poldaran