Be careful what thermostat you get. I know they sell ones that are ok, and ones that have more options for cheaper... Well I got the cheaper one. Figured it would be better, it has 2 input things so I can regulate 2 things, but after a few months i guess the one broke so now im stuck with one, which i dont mind but

I would have been able to use the second one now that im getting a second snake....
Mine was $30.(zoomed reptitemp 500R) Just sayin. Id still go with the one that I got.
Also understand that you have to keep the thermostat probe ON the uth. The snake can move it, and thats bad... If it comes out of the substrate and is sticking up the thermostat things "I need to give the UTH more wattage so its at the right temp" When really the UTH is at the right temp, its just the PROBE is at the wrong temp. Easy way to get high temps, and this makes me wonder how a thermostat can be much better then a rheostat when this happens...
FYI petsmart kinda isnt good. lol. I got alot of my stuff off of reptilesupply.com and its probably cheaper than if you got it in a store, even with shipping...
Also big tanks arent that much of a big deal. I wouldnt go with the 10 because you will just have to buy a bigger tank, and then figure out how to un stick the UTH with out breaking it, or buy a new one... I bought a used 38 tall like i said, it was $20 and came with almost everything needed and have had my BP in there since she was a baby.