Thought I'd bump this.
My wife's been at her sister's for the last week, so I've got the run of the place. I figured I'd work on a couple projects, and a DIY sous vide system was at the top of the list.
This is a pretty simple project. Parts are readily available on Amazon, I think I'm into it for about $35. This will build you a temperature controlled relay into which you plug a crock pot. I can maintain whatever temperature I want with this system, at least in the sous vide realm.
Shopping list:

I forgot to take a picture of the steak between removing it from the bag and searing it in the pan. This is after searing in oil for about a minute per side.