I have a holy paladin alt that I really want to stick to healing 5 mans with. I wanna know what stat priorities I should have when JUST healing 5 mans. I was thinking Crit/Mastery because I'm always gonna be closer to my healing targets. Am I wrong in that sense and should I go with something else?

I also have the legendary shoulders which I don't think are very good for 5 mans(could be wrong). Any tips and tricks would be very helpful.