If you buy used, and get good prices, you can get a CPU block for $30, a radiator for $30, a pump for $40, and that should be just about it. I'd recommend a reservoir, which is about $15. Tubing is pretty cheap as well. Overall, not too bad. Have I missed something?
The Swiftech MCR220 and XSPC RS240 radiators can be found new for about $40 (used for less, obviously). They should suit you just fine. For a pump, the Danger Den DD-CPX Pro is a good, inexpensive pick.
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