Actually, airflow is the most important factor, in getting a radiator to work well, but on the other hand, you have to decide what level of noise you're ready to live with.
Pelts are cheap, but the psu can run up to $100 USD.
80W used to be ok, but not anymore. The smallest one that you can use for the latest CPU, is 176 W. 226W should get you near freezing, or past it (it's not very efficient). 40 or 50mm is the size you'll be looking for.
Maze 3-1 or 4-1 are designed to accomodate 1 pelt, and they do come with a cold plate (aka spacer).
The drawback to it all is that you have to insulate everything, otherwise condensation will form. DangerDen has links posted to OcTools insulation guide, which is excellent. It can also have an effect on your electric bill, but we recently calculated it, and it's not so bad: maybe ~$5 per month.
Also, check out Joe's Conformal coating tip (in the articles section right here).
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