For ATM "best" (for me) crit gear build http://www.chardev.org/?profile=43889 ....
If you are raiding, replace neck ASAP for hit and crit one...
Enginnering and JWC, only one Pve item (trinket), for shadow dance Synapse Springs...
hit-capped for pvp, avoided mastery as much as i can, added new ench from patch....
EDIT: Unfortunately, there is NONE neck with crit+hit Only Haste+mastery pve neck.....so stick to mastery->reforge to crit for pvp neck or start rading for http://www.wowhead.com/item=65107