++"If you have some minor plumbing skills I would save some cash and buy a bath & shower faucet at your local home improvement center."
- I don't understand this recommendation. Would you mind explaining what you mean a little more?++
I'm not the person that said the above, but - - - - Are you planning on doing any of the plumbing yourself? Have you ever done minor plumbing jobs like adding a faucet? If so, you can get a shower control valve from a large home center and use it as a temperature regulator. I use a Delta brand that cost me about 60 bucks. I can control the temperature to within a degree or 2 with no problems. It's cheaper than the "dedicated darkroom" controls. For example, the Hass is $500.00!
If you want, look here for a picture of my faucet setup.
http://destarr.com/DR-4.html