If you're on a budget, look into a hydrofarm thermostat. I think they can be found on amazon.
If you have the money, I'd recommend a herpstat.
http://www.spyderrobotics.com
Any UTH should work. Aim for one that covers 1/3 of the floor of the tank. Do not use one without a thermostat!
Most use plastic planter pots for hides. Just solder out an entrance, and melt down any sharp edges.