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Get the version that has the better exclusive mons in your opinion.
Trade in some games and a few accessories to gamestop and get about $40 in store credit to get the Pokeball plus for free.
Wait for enhanced versions to come out and buy the version you didn't buy previously.
You won't need both versions at first because Trade Generals are a thing on /vp/, so filling the dex with trade mons and version exclusive mons won't be that hard.
DLC raids probably won't cost anything but will most likely be timed, so you'd just have to make time for those.
Other than the Pokeball plus, no other accessories are going to be needed since there isn't any other ones that give you exclusive mons.
All that together will only be $120 and the only downside is that you had to go to gamestop.