Unless you need the optical drive spot or the hard drive space I’d say go with a Define c or meshify c instead of the Define R6. You’ll save money and it’ll be a lot lighter
I did consider the Meshify C, but I went with the R6 with the intention of basically never needing a new case, and money is not really an issue so I thought I might as well go with the future-proof case.
I'm aware that the monitor is without G-Sync
If you know it doesn't have g-sync and plan on replacing it anyway, why spend so much on a monitor? You can get a decent 24 inch 1080p monitor for less than $200 to last you until you get a proper one. Then use that extra money to buy a better one sooner.
Check the reviews and make sure that motherboard can run you RAM over 3000MHz, otherwise such a high frequency will just go to waste. Also 16GB of RAM should be enough unless you plan on regularly rendering/processing massive, multi-tracked files. And if you did get less RAM you might be able to fit a proper monitor into your budget.
Otherwise looks good.
Not planning on replacing it when the time comes. Currently i have a 1080p 27" 60hz Samsung Monitor which i plan to use as the secondary monitor for this build. Down the line i'll be adding a G-Sync monitor to use as the main game monitor with the other two being secondary and tertiary monitors.
And yeah, Ram is expensive as hell right now, unfortunately the 16 GB I already have is DD3 which ofc won't be compatible. Will look into the frequency thing though, thanks!