Im trying to keep it under 800 and need wifi on the motherboard but this is my first time and i dont know what im doing
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Nope, the card is a x16 PCI4.0 and it will happily run with a PCI3.0 x16 motherboard with no performance impact. It also supports infinity cache.
If gaming is a major use case it makes zero sense to downgrade it. While also upgrading the motherboard. Which I would still do and also why is the original mini-ITX on an ATX case?
He also does not need a more expensive psu for the future, especially if he can use that money elsewhere. Yes, non modular cabling, modular are great but still not necessary.
A great site to help you keep to a budget is logicalincrements.com You choose your price on the first column, then it tells you which parts work together to meet that price range. Good luck with your first build!