Building on the earlier suggestion about keeping your account safe, I really think taking it slow is the smartest move you can make right now. Im also...
Regarding what #4 said about bump - it is definitely good to keep this discussion going because reliability is everything when you are shooting events...
Congrats on the upgrade! The 5D Mark IV is a legend. Since you are looking to save some cash, dont feel like you have to buy the most expensive cards ...
So +1 to what was said earlier! Honestly, ur gonna save a ton skipping those official brands. Quick tip: Maybe check out the Angelbird 512GB AV PRO CF...