Currently running a Halfling Knight 2/Fighter 2/Knight +4/Dragonrider 1/Cleric 1/Prestige Paladin 2 of Bahamut. Last session, we met Bahamut in person. He gave me a holy quest, and an enhanced holy symbol. Basically, for the remainder of the campaign, my Paladin levels are full spellcasting progression rather than half! What awesome fun can I have with this?
Current feats (no retraining): Animal Affinity, Combat Reflexes, Mounted Combat, Ride-By Attack, Spirited Charge, Power Attack, Skill Focus (Ride), Weapon Focus (Lance), Dragonfriend
Stats (inc magic items) 17/18/14/13/17/22. Base Wis is only 11, unfortunately, I didn't realise I'd be going into Paladin when I first made the character. Books allowed, the DM isn't a great fan of splat, but it's a high-powered game and I'm reasonably persuasive
Also, the Draconomicon is considered tantamount to core for this campaign - it's very dragon-centric.