well, since u are a pve dude i guess u have the hit cap sorted. I always go for the crit items. in arenas u never realy have time to stand still and pump out lighting bolts.. U just survive for that window where u can deliver a nuke combo and go for it, after that u wait for the next opportunity.

So imo u gotta deliver MAX when u can so I go crit instead of haste. but thats what i prefer