I vote against a bearded dragon. They require a very specialized set-up, and you will need to buy a new UVB light at least every six months, as well as TONS of insects for a baby. You will have to provide at the minimum a 40 breeder tank, with 4 feet by 2 feet being better, for an adult. You need to provide a temp range with a 110F basking spot for a baby as well as a cool side of 80F or so. And you need accurate thermometers to monitor it. The photoperiod is very specific, too, 14 hours of light, 10 hours of darkness. So you need a multiple outlet day/night timer to make sure the lighting is handled when you are not around to do it. The substrate must be exactly as recommended, or the dragon will get a bowel impaction, and die. Plus, you can't just go off and leave it for a week when you go on vacation. It will need fresh food daily.
Then there is the health care. If you don't do at least a yearly check up, the dragon will go untreated for parasitic worms and coccidia. That's going to run you $130 or so for the visit, tests, and treatment, because he will have one or both, every time. If you don't have perfect husbandry and health care, your dragon may not live very long, because nearly every dragon carries adenovirus, an incurable disease which blooms when the dragon's immune system is down, and is virtually untreatable.
Have you considered a nice California Kingsnake?