It made more sense to me, in my gear, to go as above. I just did an item comparason on WoWhead:
http://www.wowhead.com/?compare=4817...91:48179:48182
My setup: T9 chest + hands, T8 legs + head. Bonus over the other: 67 haste, 70 spirit (21 SP)
Your setup: T9 chest + head, T8 hands + legs. Bonus over the other: 74 crit, 79 hit.
I am currently hit capped, and with my current gear, i would drop to 346 haste rating if i were to switch to what you propose. I would have a lot more hit, which i could then remove from other items, sure, but those items would have to have more haste, which means i would probably sacrifice the crit i got with the witch, with other items to get my haste up. For example, if i were to switch my Belt of the bloodhoof Emmisary (48 crit) with Belt of Pale Thorns (59 haste), the benefit im looking at by switching from mine to yours is +26 crit rating, -21 SP, -8 haste. That still keeps my haste over the soft cap, but it gives me a ton of hit that i right now dont need.
Besides, putting on T8 hands would screw up my look completely, and i would have to hide that ugly T9 helmet, where i currently have the awesome moon from T8. You know what im talking about
Anyways, i hear what you are saying. But when i had to pick my 2nd piece of T9, i had to look at what i had available and make the best out of it
EDIT: Then again, i am getting Bejeweled Wizards Bracers today, which is a bit more haste than what i have on my bracers now (and crit). If i got the added hit from your setup, i could drop my weapon and get the one without hit, or find another 20 hit and replace both MH and OH.
You've got me thinking now. I have to brood a bit over this. (Pasta, i hate theorycrafting :P)