I was in the market for an incubator and found the discussion useful about a month ago. Bob pointed out the lack of thermostat control on most low cost units. 

So I did some research and made some calls. The Zoo-Med incubator 

http://lllreptile.com/store/catalog/reptile-supplies/reptile-incubators/-/zoo-med-reptibator-digital-incubator/

has a proportional thermostat folks told me was the tightest control range as compared to wafer or electronic versions. This incubator is economically priced and also has a water reservoir and humidity readout. The website I posted is out of stock until the end of May and other outlets said as much - they are all waiting for a new shipment but I did find a couple yet online and ordered one. 

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