Personally i prefer orcs even thought hardiness aint that great against rogues but it realy works wonders against paladins who already seems to have trouble with Hammer of resist... Not to mention that frost mage also get a stun next patch. Blood rage adds 140 spellpower on lvl 70 i belive? If you use this with NS+Elemental mastery and a chain lightning it means 280*4= 1120 more damage done overall by your shamans.

My old 29 warrior twink was orc and i managed to tip him over 1k ap with all buffs wich was pretty sick! =)