Welcome to the site.
I would use the 18 x 18 x 12 cage, it should last a year or so. After that I would move up to a PVC reptile cage like these made by Animal Plastics
Keep in mind that UTH's don't increase the air temperature in the tank, so only use it to generate the hot spot of 90 degrees. A heat emitter or infrared heat bulb with a wattage of 75 should be enough. I would get a lamp dimmer to dial it in.
Eco Earth is great, but make sure that you don't make too thick a layer, as anything more that 1/2" will render the UTH useless.
Your list looks good, but let me recommend certain products, as almost everything sold in pet stores is overpriced junk:
Hides:
http://www.reptilebasics.com/hide-boxes
Hygrometer:
http://www.amazon.ca/gp/product/B000...pf_rd_i=915398
Water dish:
http://www.reptilebasics.com/medium-water-bowl
Thermostat:
Budget: http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S
Mid-Range: http://www.reptilebasics.com/ranco-etc-111000-pre-wired
High Quality: http://spyderrobotics.com/home/products.html
Thermometer:
This can be purchased at Walmart for $12 it measures 2 temperatures (the probe measures the hot side and the thermometer inside the unit measures the cool side) It also measures humidity.
This is how I house all of my BP's, I have found that the simpler the cage, the better:
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