So, if I wanted to build a stock of spare parts, what would the list look like in terms of priority of most failures and parts hardest to get? I was thinking of about $400/year for new and used parts.

Here is my starting point –

Rear under door cladding
Used ABS brake module
Used TOD module
Used engine controller
Shifter knobs 2
Center console hatch cover
Window regulators – RL
Aluminum door sills – RL
Door speaker cover
Used CD player
Stock muffler
Original stock shocks
Headlights LR
Used rear door weather strip
Intake gaskets 4
Fuel tank sender
Rebuilt front CV and half shafts

Please add your recommendations to the list.
Thanks, Roy