Those snake kits are 100% waste of money. You will have to replace 90% of the stuff that it comes with. IMO for a basic, safe set-up for someone with ONE snake would be:
A 20 gallon long tank
A UTH (under tank heater) WITH a thermostat.
Substrate, I use aspen
Two identical hides
A nice sized water dish
Black out the sides and back of the tank (I use Con-tact paper from Home Depot $6)
In some cases, you can get a CHE (ceramic heat emitter) to raise ambient temps, and even those should be connect to a dimmer.
And a digital thermometer/hygrometer (such as this http://www.amazon.com/Chaney-Instrum...0852211&sr=8-1)