Your on the right track! Everything sounds good with exception to the UTH which you have got a thermostat on the way for so thats good. If you are concerned about the cool side being too cool, move the lamp over that side and it will warm up the ambient temps, while the UTH will provide the warm belly heat needed under the warm hide.

A second UTH is a great way to go, I have 2 as well. I have one turned off for the summer though because my tank is warm enough with out it in 20 degrees plus weather. When you get the second UTH, if your thermostat can only control one device then you can use a lamp dimmer on the cooler UTH set super-low.

All in all, as long as you get around 90 for the warm side, low 80s for the cool side and humidity 50-60, however you chose to do that (safely lol) is totally up to you.