Respec for my priest.

[MongoJerry]

As far as Holy Spec, with my significant investment in shadow, will I be doing a lot of holy damage still while soloing?  In the group I will not be focusing on damage.  I had assumed once I get mind flay/mind blast I'd be using them more for damage while soloing.  Mana efficiency looks similar, and mind flay has that lovely slow effect, not to mention the possibility of blackout triggering.

I think Xanthix was suggesting holy spec, because it improves the chance of getting critical heals. Basically, it's a way to give +5% chance to crit on all those flash heals you've been casting.