Now before choosing gear let’s revise pieces of info we already gathered. The stat prio is sp>int*if low on mana>crit>haste*if capped>spirit/mp5 and this should be your key in bidding/stealing items. To back this up, you’re playing on patch 3.3.5a and the high end content you’ll be farming is ICC and Ruby Sanctum. Both of these are raids that encourage hps-burst to hps-sustainability. Feel with it.
Equipped with knowledge like this you should be able to make gear choices that best benefit yourself, your playstyle and your raid colleagues. I’ve prepared some bits and pieces on those potential choices and tried to shed some light on a few discussible issues.