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For comparison, I recall the Troyer kit to be pushing $500, including two fans and two controllers, the latter being key to not overheating due to a single controller failure. Do not think all kits include such. Anyway, know what you are buying.
Ahh, didn't know they had two controllers! of course, when I bought mine, I found it difficult to navigate troyer's site :/ so I just ordered mine from Jegs