I paid 400 for mine used, it rocks the world, I am not surre what you will be using it for though as it is not a very good 24/7 solution IMO
Condinsation being a concern it is more at home for benching.
I basically use mine for dialing in settings for going cold
On 1366 idol my unit will hold -50C and on a 1024 prime run around 0 to 5 C
Best thing I can say if you plan on getting into the benching scene it would be a great investment and is a lot of fun and easy cold, you will not break any records or anything with it.
If you go this way do the research on properly insulasting your board, this will insure a positive experience
Scott built mine but I got it second hand, rock solid but needs to rethink the relay he is using as it is a piece O ****Edited by Witchdoctor - 8/7/11 at 6:51am