Consider Sorcadin (traditionally Pal2/Sorc4/Spellsword1/AbjChamp5/SacEx8, in that order). Venerate Bahamut, a legal Pally deity due to his LG nature. Play it that Bahamut's order is more loosely organized than say...Heironeous', simply due to the draconic nature of Bahamut, and the traditionally more solitary nature of dragons. Then just wander the globe amassing treasure, helping people, and laying the holiest of smackdowns upon all that is ugly and evil (in that order). Your spells are your weapons and your armor.
Commit to the build: take the Draconic Heritage and Draconic Breath feats.
Learn mostly utility type arcane spells, use them mostly outside of combat, then breathe fire (or lightning) on foes that REALLY need a butt-whuppin'.