i dont know where your getting your numbers from but 150 haste which is all three off pieces only gives you about 4.8% haste. I dont know how the belt and bracers from ToC can give you 20% alone.
Bracers of Autumn Willow
Belt of Pale thorns
Relentless Gladiator's Blade of Celerity
Relentless Gladiator's Compendium
Titan-Forged Band of Ascendancy
12sp/10haste gems x8
Total 322 haste = 9.82%
Add in the 10% haste from GotEM and 1% from Celestial Focus and you're at 20.82%
In the mean time, with the new set bonus changes, you'll have 2850+ SP while keeping 900 resilience.
I'm a JC/enchanter so I'll have
121 spell pen