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To me your list looks good but I would add a 160 thermostat while changing your radiator. What are your supporting mods? What model C6 are these parts going on?
If he has an ECS supercharger kit (assuming so since he's ordering an ECS meth kit) then he already has a 160* thermostat
Are you having overheating issues? Don't bother with the radiator/brushless fan unless you need it
Meth kit would be moved up the list for me
The mods on the car now are the ECS SC 1500 kit, Evans water pump, and heads worked to address valve issues. My coolant temps do jump if I beat on the car, but return to normal when driving normal again. Dead stop traffic isn't issue either. Temps stay ok. But roll racing on highway they jump to 240+