Not to sound like a siren harping the same tune, but take a look at immersion/sous-vide cooking units. They can handle what you're trying to do just fine, and can be sourced for under $100 readily online, new. I purchased a near-new Anova unit off the local classifieds for $80(half of new price) and it works fine for maintaining any temperature range I set it at. If you run a bath/shower/faucet to get water to near-temp as much as possible, then use the sous-vide for fine temp adjustment/control, it's really quite easy. So your Jobo would essentially only be acting as a circulation pump. Keep a couple frozen water bottles in the freezer to lower temperature, if needed. Re-freeze as necessary.
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