Circulation through the heater says the pump is working. It is very rare for a pump to not move coolant. It is possible for the impeller to rust away, but takes years of system neglect for that to happen. I've only seen one impeller fail, a plastic one that split and fell off, of course there was no movement at all.
Are you sure it really is overheating? Can you verify the temp gauge is accurate? Did it still show high temp with the one thermostat out?
If it ran cool with one thermostat out, I would replace both thermostats. That would be the easiest and least costly first approach. Then see what happens.
If it still overheats (and you know the gauge is good), look for symptoms of a head/head gasket problem, such as mysterious loss of coolant with no external leak, over pressurizing and blowing coolant out the cap, water condensation under the oil cap, valve cover, dip stick tube.
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