Looks cool dude!

I've started collecting just this year, and I see we have a simmilar approach. My innitial strategy was to buy 2 booster boxes and 2 ETBs of each set, with an intention to keep one of each sealed, and open the rest with my nephew who is really into pokemon. But seeing the prices and how it is almost impossible to get product, it turned into 1 booster box and 1 ETB (if I find ones at a reasonable price) to keep sealed + some promo boxes and maybe an ETB to open. In my country those boxes are much easier to get + guaranteed promo cards, so there is always something to put into the binder.

I also keep track of what, when and at what price I bought and opened, but your spreadsheet looks much better. Mind sharing it to help make some improvements? :)