This is a setup I'm making for a friend, I did a quick job the first time and ended up with hoses and crap everywhere, so I thought I'd rectify the suitation.
The HDD cooling set up is to make sure his 240gig worth(over 4 drives) of storage doesn't cook in our hot queensland summer.
The pump is a resun 1200 (pow-3 I think) with my in-line mod, small enough to hang off the copper tubing (reducing vibration noise) water block is something I quickly knocked up, nothing special performance wise but adequate for the task (quiet being the aim, not overclocking) radiator is the heater core out of a datsun 120y, or 180b, I forget:o
note the fill tube, which comes directly out of the heatercore, fills/drains very easily.