Well, I'd probably get the lamp (Cost you between $25-$30). Newspaper's a fine substrate, easy to replace. If you get a log from outside, wrap it in aluminum foil and heat it in the oven at about 400 degrees to kill all possible bacterias. Your moisture chamber sounds fine, but yes, you do have to mist it daily. Your water dish should be about knee-level on the gecko and wide enough for him to soak in it. A single, normal phase gecko generally costs about $30 (designer morphs can be significantly more expensive). Food is about $10 per week. (This'll get you up to 50 crickets depending on where you go). For a reptile, a Leopard gecko isn't all that expensive, but it does cost some.

Hope this helps.