Peltiers are a lot of work to get right, wouldn't even bother going down this route unless you really know what your doing.
Water cooling would be easier and cheaper (depends on your implementation of Peltiers I guess) though still isnt cheap or easy.
I get the impression your not too knowledgeable on cooling solutions. If your running a stock air cooler, something like a 212 EVO would be the best move rather than a more extreme solution.