I wouldn't even use the UTH for the time being. Your ambients sound the same as their natural habitat.

This is just as cheap as the Repti-temp, but much easier to use if nothing else.

At walmart there's a $12 Accu-rite indoor/outdoor weather station. Put the probe under the substrae against the glass right above the UTH. The more substrate you have, the hotter it will be underneath. Once it's set, you never have to move the substrate to check the temp.

Get two identical hides if you can. It will make them more comfortable.

And yeah, lights are only a last resort when your ambient temps are too low.

I've been told temps down to 75 are acceptable.