Dämologie
Stand: Patch 4.3

Lower (iLvl 359 - 378) Gear Levels
Int = Hit (to cap) > Zaubermacht > Haste (1007 Rating) > Mastery > Haste >= Crit

Mid (iLvl 378 - 397) Gear Levels
Int = Hit (to cap) > Zaubermacht > Haste (1573 Rating) > Mastery > Haste >= Crit

Higher (iLvl 397+) Gear levels
Int = Hit (to cap) > Zaubermacht > Haste (1993 Rating) > Mastery > Haste >= Crit

Some notes on stat weights:
The importance of haste thresholds is much lower (almost negligible) on single target fights. Instead these thresholds are much more important in situations with 2 or more targets and you can multi-dot.
In most cases you will begin to reach these thresholds automatically as you gear up (in full BiS 410 gear you will have over 2000 unreforgable haste). In a Patchwerk encounter my recommendation would be to reforge for full mastery and ignore these thresholds, and as always, sim your specific gear config using simulationcraft!

Zerstörung
Stand: Patch 4.3

Item Level 359 - 378:
Int > Zaubermacht >> Hit (to cap) > Haste > Crit > Mastery

Item Level 391 - 397:
Int > Zaubermacht > Hit (to cap) > Haste > Mastery = Crit

Item Level 403 - 416:
Int = Hit (to cap) > Zaubermacht > Haste (2681 Rating) > Mastery > Crit > Haste

2681 Tempowertung (2527 rating for Goblins) with full raid buffs provides Feuerbrand with an additional 4 ticks (9 total) while under the effect of Heroism/Bloodlust.

Gebrechen
Stand: Patch 4.3

all Item Level
Int > Zaubermacht >> Hit (to cap) > Haste > Crit > Mastery

This should basically be true at all levels of gear.