Cooling System Refresh - missing anything?

[Entropy]

I have decided to perform a cooling system refresh on my 2007 4.8i (77k miles), including a preventive fix to the leak-prone coolant pipe. Below is my parts list; am I missing anything?

- Water pump
- Thermostat
- Primary and A/C drive belts
- Coolant (2 gallons unmixed)
- Hoses & expansion tank (replaced at 64k miles, omitting from refresh)
- BimmerFix coolant pipe stent kit (thoughts?)
- Idler pulleys (I am going to measure all 3 idler pulleys and attempt to replace with better metal Gates/Napa/Dayco units. Both tensioner pulleys are only sold as a single unit with the tensioner. If I'm unsuccessful, I will replace with new tensioner units.)

Water pump pulley? Any other seals to replace at the time? The vehicle has already had the timing cover gaskets replaced, along with air pump seals. Thanks all.