When Patch 3.3 comes out, Crusader Orb prices are likely to plummet. I don't expect 3.3 to hit for another month or more, though. So unless you get really good at playing the AH really fast I will second Nephyr's suggestions. :p
Lemme see here... ran a few searches for my rogue a bit ago. I'm a bit curious to see how they turn out for another class/spec. It's pretty easy to do when you know what to search for and employ the power of search filters. With just a minor adjustment to the searches, any class can benefit from this method, so this post can serve more than Dash alone. In this case, I've set it to gear usable by Paladins without any Spell Power (almost all healing gear), Defense (most tank gear), and Resilience (PVP gear). So here we go!
ToC 5 man regular (
main search)
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cloak,
bp,
gloves,
belt,
helm,
ring,
trinket. As I understand it, neither the ring or the trinket are optimal for Paladins, but unless you can get one of the optimal ones these will still do you well. It has been pretty hard to find rings and cloaks with Str on them in Wrath, and armor pen isn't the most ideal of Paladin stats.
ToC 5 man heroic (
main search)
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legs,
shoulders,
boots,
bracers,
neck. Neck carries the same caveat as above. There is also
this axe which is a decent upgrade from the Champion's Seal sword, provided you can make up the hit elsewhere.
So with just ToC you could get helm, neck, shoulders, cloak, bp, bracers, gloves, belt, legs, boots, weapon, 1 ring, and 1 trinket. This leaves you with another ring, another trinket, and libram slot empty. :p Onward to perhaps not so coincidental loot from triumph emblems, added to the game at the same time as ToC!
Triumph badges (
main search here)
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libram. This might want to be your first triumph badge buy. I'd have to check with a ret to be sure but the similar libram/idol/totem/etc slot items for 25 triumph emblems all end up with an uptime of nearly 100% with the buff it procs. That means nearly 100% uptime on 200 str for these 25 emblems. Very nice!
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ring. 35 emblems, pretty solid stats. With two ring slots to fill I doubt you can beat this.
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trinket. 128 hit is a ton. This is a blessing and a curse. For one, it's 50 triumph, which is kind of a lot (especially when you add in the libram and ring, which are both really top notch buys I believe), but if you can make use of that huge hit rating it will be worth it. The curse part comes in later when you're trying to stay around your hit cap whenever you get a new upgrade that gains or loses you hit. 128 on one item is unwieldy. :p I don't know if this is worth it or not... I mean, it's a great item, but you have to compare opportunity cost on not spending the emblems elsewhere.
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ilvl 232 ret set. T9 you can get without raiding! Shoulders and gloves you can get for 30 triumphs each, while the other three pieces are 50 triumphs each. If you get into ToC25 PUG raids, you may be able to get a Trophy (1 drops each boss) which essentially lets you get an upgraded version of any of these pieces. ToC25 and ToC10 raids also get you a TON of triumph emblems compared to the 2 per day per daily heroic quest.
There are some misc other pieces you can get for Triumph emblems, a hat and shoulders I think, but whether or not you should get them depends on a lot of factors and go beyond a simple list of a starting set of epic gear.
Conquest emblems...
main search here All of these items are higher ilvl than the ToC 5 man drops, which as a general rule means they're better, but it still should be taken on a case-by-case basis. Check the search link for the results. Of note is the hat and bp token, the Wayward Conqueror stuff. This is 25 man T8 gear. I don't know if the 2 piece bonus is any good for ret pallies, but as a guess I'd say they'd be what you'd ideally want to start PUGing ToC10 and 25. Moonkin 2 set T8 bonus makes it good even with ToC 25 gear... so it all really depends.
Conquests can also be traded down for Valor and Heroism emblems on a 1:1 ratio.
Search results for Valor emblems here, and
results for Heroism here. You probably don't want any gear from the latter, though as you can see Heroism emblems have other uses, basically for when you run out of stuff to buy.
Lastly, crafted items -
search results here. Click "Level" at the top of its column to sort the list by item level. The 226 belt and boots both should be affordable. I think The 200s are probably made obsolete by the drops from ToC 5 man.
My suggestion would probably be to run both normal and heroic ToC 5 man, a lot. Make sure to do the heroic daily for the 2 Triumphs per day. Run a bunch of other heroics too (pretty nice starter ring from the boss of Gundrak heroic if you really need expertise!) for Conquest emblems, though Naxx or Ulduar PUGs, provided they're not terrible, would also be a great source for Conquests. Buy T9 two piece from Conquests. Check the price of Runed Orbs on your AH, as they're for both of those ilvl 226 crafted items, as those would probably be great too. Runed Orbs can also be bought with Conquest emblems, so keep that in mind. Libram and ring from Triumphs are great buys, and if you feel comfortable doing ToC 10 or 25 PUGs, the Triumph emblems will come pretty fast.
Keep hit and expertise caps in mind while gearing up. I don't know exactly to what degree they're important to rets. I think hit is extremely important (as it is for nearly every dps class) while expertise isn't exactly vital, but still something you should try to make work.
Kinda crazy how fast you can gear out a char nowadays to be competitive in the current raiding tier, eh, without even doing much more than some 5 mans. :p