Go with a T10. I have 3 T10s, 3 T8s and 3 T25s and for my 4.5' female BP, i use a T10 with a shelf. T8s will work but i personally feel they are kind of short. I use them for my baby or juvenile boas but a T10 with a shelf will give your BP lots of stuff to do and they will use a shelf if provided with one.
As for heating, it depends how cold your room gets. If it stays above 75F, then flexwatt should be plenty. If it drops below 75F, then i would use a RHP.
And i would for sure get the LEDs installed. They look really nice and are clean and recessed into the top so there are not wires or anything for the snake to pull down.
You dont need any more venting than the supplied ones. Dont add any circle cut screens or anything.
RHPs are installed on the top inside of the cage on one side. If you opt for one over flexwatt, then you can have Pro Product drop ship it to AP and they will install it.
Personally all my cages are the same setup as in sliding glass doors, locks, LEDs, shelf and flexwatt.
Here is a pic of the T8s compared to T10s to give you an idea. The top 2 are T8s and the bottom 2 are T10s.
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