Disregarding my spec; what do you guys think the best spec is for a holy paladin in arena?

Personally in BC days I used to go for Holy/Prot, for decent healing and mitigation/CC breaking. But I've heard of holy paladins going down to repentance in ret. To me this seems like they are sacrificing a helluva lotta extra healing for 1 stun (which will probably get trinket'd anyway.)

Can you reply in a format like:

[link to spec]
-Reasons why you like that spec
-
-


Thanks