When I had a tank, I found ceramic heating elements to not kill the humidity as bad as a regular heat bulb. I'd get a 100 watt CHE and maybe a smaller dome so you can cover more of the screen top. I also used a thick towel folded over to cover the top and would soak it with water regularly. This helped a lot for humidity. That and an UTH should really help. For individual setups, I like the Ultratherm heat pads from reptile basics. They can be used with a simple on/off thermostat to maintain a good hotspot.