The suggested aura bonuses sound nice. Even if its a 1 AP buy after taking the 2nd tier PRE for example.
And lowering the cost of a couple of the enhancements for Paladins would go a long way.
Some of my characters, I almost get lost wondering where I should spend all these AP for the best results. On my paladin I have never felt that way, I feel as though as just basic stuff I should have I cant even afford all of. Then again maybe its just that so many of their enhancement options are good choices.
Lowering the cost of extra smites, and the pre-req costs for the PRE's would be a great way to do it. The faith line requirements for the third tier are way more expensive than I would like. I would never spend that many AP on them if they didnt lead to the PRE, unless I was... longsword spec'd.