The RHP with the UTH on dual proportional t-stats will do you fine. There are certainly other options and this route may not be the cheapest, but I like how the RHP is SAFE. It works like the sun and it will heat the floor of the cage just fine after a while. If you leave something outside in the sun too long, it'll heat up - you know how concrete gets hot on your feet in the summer time? The sun heats it. The RHP does the same thing. The correct wattage is the key to getting the full vivarium heated appropriately. Combined with the UTH, you can achieve a nice localized hotspot. I would mount the RHP in the center but slightly offset towards the hot end where the UTH would be. This should create a good temperature gradient. However, I agree that you discuss this with the guys at Reptile Basics or Pro Products - they're experts on wattage and placement.
I do not think a CHE would be in your best interests. They are not as safe and they'll suck the humidity right out of there.
As far as t-stats, there are several you can pick from. But I would suggest the Vivarium Electronics VE-300x2. It is dual-zone, proportional, and has night-time drop. You can get that at Reptile Basics too.
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