I'm just doing some random theory crafting and I thought this might be a good place to do it.
I'm thinking about speccing ret towards the end of season 2 as soon as I start getting a near full set of gladiator/honor scaled gear. I'm aware that most ret paladins seem to prefer pure AP over spell damage because item budget wise you get more bang for your buck. This results in paladins with small heals and a small mana pool and thats not the way I want to play my character.
my plan is to stack spell damage enchants/gems in scaled gear. Ill just list off the top of my head what I'm thinking. If we assume that point for point AP and +SD are effectively the same (
not including auto attacks) I'm going to just calculate the loss in effective AP from switching to spell power.
+20 damage to gloves (-10 ap from 15str)
+35 damage to legs (-15 ap from expensive ap enchant)
+15 damage to shoulders (-15 ap)
+36 damage from the 4 red gem sockets in merciless gladiator gear (-28 ap from +8 str gems)
+40 damage to weapon (-30 ap from savagery)
+15 damage to bracers (-9ap from brawn)
----
+161 damage (-107 effective ap)
Merciless gladiator set has +153 damage
Veterans scaled set has +86 damage
I don't really have time to do the math on how much AP you would have with a full scaled set with rest of the slots honor gear or whatever you want, but lets just take a fairly conservative stab at it and say 1400 AP
which derives into 2 choices
1400AP and +400 spell damage (effectively 1800 AP)
-or-
1668AP and +239 spell damage (effectively 1907 AP)
Now, obviously the pure ap build is going to do more damage as we can see by the effective AP - but I think the extra spell damage is an acceptable tradeoff for increasing your heal utility while not entirely gimping your damage.
for yellow slots Im leaning towards the +4 crit +6 stam green gems, but if the pvp gear has enough crit on it to keep vengeance up on its own I might replace some of those with red +SD gems.
For extra fun I might go for
http://www.wowhead.com/?item=31856, which I've heard reports that SoB procs both and I'm hoping SoC does too.