You only really need one UTH unless you are not using lamps. I am not sure how your climate is where you live but a lamp or CHE will dry out the air in the tank very quickly and make it very hard to maintain proper humidity. If you can at all help it, don't use the lamp at all. If your ambient temps are around 75* or higher you are good to go. If they are a little too low you can get a lamp dimmer to use with the CHE and only turn it on a little bit just to raise the temp by a couple degrees.
My personal opinion of eco carpet is that it is a waste. Once that stuff gets introduced to a wonderfully huge BP poo, it will no longer be the same. Wash as you might, it will still smell like well...crap. I prefer paper towels, newspaper, or aspen. Cypress mulch will also work and helps to raise humidity.
As for the thermostat. I would recommend this one first: http://www.amazon.com/Hydrofarm-MTPR...1529683&sr=1-7
The next best and cheapest thermostat for single setups is the reptitemp 500r. If you can afford it, a ranco or johnson controls thermostat from http://reptilebasics.com would be your best bet.
I am fairly certain that you can use the ceramic heater in a clamp lamp as long as it has a ceramic socket. I don't really use CHE's or lamps at all for that matter.
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