Humidifiers can be a big help but make sure to watch your temps when using one as they tend to lower your temps a bit. The debate on analog vs. digital is a big one but I use a Flukers digital thermometer/hygrometer and it works fine for us.

Best advice I can give is to make sure that ~60% of the tank is covered by a nice damp towel, mist as frequently as needed (but the humidifier should take care of that) and if needed switch to a UTH as heat lamps kill humidity.