If you want to get AC just for leveling you could do it like that 'game that will not be mentioned because i do not know if it is tradmarked or not' and give everyone half their level to AC, but then where is the fun in that. And personally i would rather spend gold on increasing my AC than feats, feats are much to important for that.
Also another fun way to increase your AC to ridiculous levels is to take one level of Draconic Sorcerer and start down the Dragon Aprentice prestige class after level 5.