As mentioned previously, a T8/T10 would be great, but make sure you get all the heating elements you will/need want from the beginning and a really good thermostat. It's a bunch up front, but sounds like you want to do, and they are stackable cages. If you spend little more now and want another snake down the road, you can buy a thermostat today that can do multiple tanks. Thus, saving money later.
I personally, and depending on your room temps, would get some flexwatt/UTH in addition to an RHP. You can run off the same thermostat and I like giving my snakes belly heat. It also gets down to 67F in my finished basement/snake room in the winter.
You may never need to run both, but the small incremental cost initially means you are future proofed.
I have my BCI in a 6X2X1' Boaphile tank and have a RHP and UTH on the hot side and an UTH (smaller one) for the cool side. Much bigger tank, but also can get chilly in my house. The incremental cost for the heat tape was so small compared to the tank and thermostat, I did to be safe. I find both the RHP and UTH run, but not much at all.
Just my two cents. I also do not have AP tanks. So others may have different views.
You are asking the right questions! Good luck and awesome looking snake!