10-20 isn't a small collectionEven small collections are worthy of a nice thermostat. In the long run you will be happy you bought a nice one! I love my helix. Sometimes I forget to check on it because it's always spot on and has never given be issues. If you're going to buy cheaper ones I wouldn't go any cheaper than a Ranco or Johnson. Both are good quality, but they are on off thermostats so they aren't a constant temp. If you go any cheaper than Ranco or Johnson you might as well use a lamp dimmer from Wal-Mart, it would be safer IMO.
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