Originally Posted by
AylinIsAwesome
A GR+3 tome would let you change 3 levels, but it remembers the order.
If you take Rogue at level 1 now (but you didn't previously), that counts as one of your three class-level swaps. Putting that Paladin level back in when you took your first Rogue level counts as a second one.
Anyway, right now Paladins aren't considered to be DPS characters. KotC only works against Evil Outsiders, which make up such a small percent of the end game at the moment. Most Paladins now take Defender of Siberys for that reason, and get the extra +STR/CON, as well as the bonus 10%/15%/20% HP.
Unless you're planning on sticking with mostly Should and Shavarath, then I'd suggest DoS (especially since right now it's more DPS against more end-game content than KotC is).
As for a final level split, if you can't get to 18 Paladin, then 15 Paladin (Bulwark of Good 4 and Divine Might 3) or Paladin 14 (casting Zeal) is fine.
Looking at what you've got, your options seem to me to be:
1. 18 Paladin/2 Fighter (dropping the Rogue levels)
Pros: Get DoS3, 2 bonus feats from Fighter, longer duration on Zeal and Divine Favour
Cons: Lose UMD and Evasion
2. 18 Paladin/2 Rogue (dropping the Fighter levels)
Pros: Good Reflex save with Evasion, UMD, situationally higher DPS (from the above), longer duration on Zeal and Divine Favour
Cons: No bonus feats
3. 14 Paladin/4 Fighter/2 Rogue (take Rogue at 1, turn 2 of the other Rogue levels into Paladin levels)
Pros: Get Zeal, Weapon Specialization: Slashing, UMD, Evasion, Haste Boost 2
Cons: Lose AC potential (if that's important to you, though it is highly gear dependent), only 1 level 4 spell slot, lose DoS3
4. 15 Paladin/2 Fighter/3 Rogue
Pros: Most Sneak Attack, UMD, Evasion, ect.
Cons: Lose DoS3
To be honest, if you can live without Extend and either OTWF or SF:UMD, I'd suggest going with the 18 Paladin/2 Rogue.
18 Paladin/2 Fighter is also pretty potent.
Out of options 3. and 4, I think right now 3. is a little bit stronger, but 4. offers you the option of using a LR+5 tome to switch to pure Paladin should you want to when the enhancement revamp comes out.