That is a really big cage, so a 200W may be necessary. As long as your thermostat keeps it at the right temperature it doesn't really matter. (as long as you don't go over the maximum wattage of your thermostat)
For substrate I would suggest Eco-Earth/any of the other coconut husk based substrates. These are great at maintaining humidity, and look natural.
Just a clarification. You plan on getting a BP or a blood correct? You cannot house both in the same cage. I don't think that is what you meant, but just in case.
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