Cooling your i5 with a possible gpu later I would start with a 360 rad/fans, D5 pump, EK cpu block, Primo ltr tubing, compression fittings and res of your choice.
EK-Supremacy $90
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_971_498_490&products_id=38120...