A couple of notes:

Engineering is not to be underestimated: It provides the very awesome goggles, and the goblin rocket launcher which is superior for a paladin tank IMO. (Useful when pulling a pack with a hunter CCing so he doesn't have to compete with my Avenger's Shield - not a big issue for multiboxing)

Basically, grab all instance "of the Righteous" gear you can, buy the the Felsteel Gloves from AH and get your Keepers of Time rep up to Revered so you can get the Timekeeper's Leggings, Continum Blade and Glyph of the Defender. I prefer the Shield Wall over the SSO shield, although, the SSO shield looks cooler. The Aldor Chestpiece is a decent piece, but I've never had the rep by the time I outgeared it. IMO, armorsmithing isn't worth picking up, as it is very expensive, and most of the useful stuff is either BoE or BoP from patterns that are only dropped in raids.

The only PvP pieces you should focus on are the Arena Gavel, then Shield Wall, and then shoulders, as good shoulders are tough to come by.