I wanted to share with you that we've had great success with a $60 dollar temperature control kit.
We are sous vide converts!
Here's a link to the build blog if you are interested in building your own.
http://arduinoforgoodnotevil.blogspot.ca/2013/05/modernist-cuisine-diy-sous-vide-part-2.html
I don't sell the kits, but there's a link on my blog if you are curious.