OK - I only have experience with one brand, so take my advice for what it's worth.
I currently have a couple of Big Apple Herps proportional thermostats. They are around 100 bucks - and work great. The heat is extremely even - it's easy to use - and I never, ever have to worry about it. It has a night drop built in if you want to use that too.
They are a great company to deal with - fast service, very painless.
I also know that Boaphiles has the Ranco thermonstats, and I've heard really good stuff about them too.
Good luck - I think you will like how they work.
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Monte Meyer
Powergeckos
Email