First off, I'm a little disappointed that you didn't get a proper setup BEFORE you got your snake.

With that said, nobody here can recommend a specific bulb for your snake. There are a lot of variables including the type of cage, the temperature of your room, etc.

The snakes cage should have a temperature gradient from the low 80s to the low 90s. An UTH can accomplish this by itself if your room temps are comfortable and you use a decent thermostat. If your room temps are cool, you can suplement the heat using a low watt bulb along with the UTH and thermostat.

Most UTHs will work just fine, but you should spend a little extra on the thermostat. Some decent ones to consider are Johonson, Ranco, Helix and Herpstat.

Good luck!