I just (2 days ago) built a new 1.2Ghz Athlon system and have gotten most of my parts for a water cooling setup. Right now I'm just using a cheap Cybercooler P5600 air cooler without overclocking it. My temps got up to 50C the other day. So, I'm waiting on my water jacket (everything else is already here) to come in, before I test run it for a couple of days. I'm not going to put anything near the computer during the test. I am going to install a drip/spray shield in my computer when I actually put my reservoir, pump, and radiator inside my case. I'll probably just use some gallon sized ziploc bags and some good tape for that.
anyway....
Here's how much my components ran me:
1) DangerDen Maze2 copper waterblock (with fasteners)...$42...
www.dangerden.com
2) AquaStealth Cooling Cube copper radiator...$54... they had a cheaper dual fan radiator for $30, but i went with this one anyway, because after buying two fans the price would be close to the same...
www.aquastealth.com
3) a micro jet 117gph submersible aquarium pump (recommended by an aquarium guru at work)...$25
4) 120mm Panaflo fan (ordered from AquaStealth)...$14
5) tube of Arctic Silver II thermal compound...$8
6) anti-corrosion water additive...$4
7) tubing from Home Depot...$3
....... total was around $170 after shipping ......
I bought all of this stuff in preparation for some good overclocking. If you aren't gonna overclock and don't want to play with water cooling just for the fun of it, I would spend my money on something else.
good luck..............