Not a bad list. It definitely operates on a different train of thought to mine (and mine was admittedly influenced by the bad advice regarding these items’ prices in the DMG)
My principle form the DMG was that Uncommon items cost between 100 and 1,000, Rare items are between 1,000 and 10,000, and so forth.
My secondary philosophy is that every extra effect on an item costs exponentially more than the last. Mostly to prevent people from making uberweapons on the cheap.