I have several of the Ranco digital temp controllers on Ebay (same as Johnson except no 5 minute time delay). I have both single and two stage controllers. These are all I use and I use them for everything.
Single stage heat or cool
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320591056807&ssPageName=STRK:MESELX:IT
Two stage heat and cool (A must for fermentation Chamber)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320591051958&ssPageName=STRK:MESELX:IThttp://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320591051958&ssPageName=STRK:MESELX:IT
Single stage heat or cool
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320591056807&ssPageName=STRK:MESELX:IT
Two stage heat and cool (A must for fermentation Chamber)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320591051958&ssPageName=STRK:MESELX:IThttp://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320591051958&ssPageName=STRK:MESELX:IT