I would go with the T8 and not the T3, you can always use the divider to make the living space smaller if you feel the need, and when using the divider you can keep 2 BP's in the same cage. Sim already posted a link to my thread, it should answer most of your questions. If not feel free to ask.
I use AP cages and spyder robotics thermostats for all of my reptiles. It is a great combo.
To answer your questions directly:
No heat lamps are required. Depending on how cold your room gets you might want to get a Radiant heat panel instead of flexwatt
The 11" flexwatt is all I use in most of my cages. It works great, but my room temperature never drops below 70 degrees. AP cages are very well insulated, and tend to stay a few degrees warmer than the room they are in.
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