You have a perfect application for a water chiller. Granted you won't see crazy cold temperatures, but a water chiller will be much more cost effective and easier to build. Phasechange.com is the best place to go for help. I would suggest:
1. two 1/3hp danfoss compressors with r22.
2. Condensors of whatever size fans you will use (rParts has a good selection, so does ebay)
3. You'll have to make your own evap. A copper coil inside an insulated 3' tube is a good idea (25' 1/4" Cu tube should work).
4. A water cooling loop suitable for sub zero temps. Avoid using pumps that use ceramic components as they might shatter. Maybe a couple of DDCs?
You can expect temps in the -20C range. Maybe lower. R22 boils at roughly -42C. How well you build your system will determine how low the system will go.
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