If you really want to go down into the threshold issue, you'll probably not come around to account for the "real" haste value.
According to http://elitistjerks....l_85_cataclysm/ this is 326/(10*82/(262-3*70)) Â¹ at level 70.
Although there may be another round of rounding involved in the calculation of the haste value itself (and which is different to what the character sheet says).
Â¹ Haste Rating / ( Base Rating at Level 60 * ( 82 / (262 - 3 * Level) ) )
Interesting. I will say that (thankfully) the calculations end up still being extremely close.
I did test on my 85 (which is only Combat however) to make sure I was correct, and the numbers in-game came out virtually the same as the manually figured numbers. I say it with such words since there's still rounding involved.
Oh yes, and I do have a new question to ask. What are the proc rates of the dagger sets' Suffering, Nightmare, and Shadows of the Destroyer buffs?