So, I see several things here, that I did during my first build that I now regret:
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You have a relatively limited budget. You're spending an awful lot of that on your case. If you're not absolutely married to the idea of that case, I would suggest to go for something cheaper. (Check out Gamers Nexus' end of year round up for some suggestions)
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You're buying a pretty top of the line motherboard. I would suggest looking at the features this delivers and what you really need from that. Why not a B-Series with WiFi ( if you need that)
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Once you managed to free up those additional 100-150$, you can look at upgrading your GPU. Maybe even a 6800XT.
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For the windows: there are third party resellers selling OEM versions of windows for like 10$. Look around the net a bit. There's ways to get reaaaally cheap (and legal) versions of windows.
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If you really want to stick within the budget, I would suggest going last-gen, depending on how enthusiast you are. Max out the GPU, go cheap on everything else. The 5600x has been a beast of a cpu, the mobos and ram for it are cheap. My suggestion (with still outstanding overhauls to the case and windows version) looks like this.
If it was my PC though, I'd probably go current gen but still work on the case and windows version. AMD CPU may probably still be cheaper.