Nice, I also just got an r9 290 off Craigslist for $50.
You could get the Cooler Master MA G100M RGB cause it's slim and will match RGB fans.
I also found a r9 290 (non-x version) for $50 on Craigslist!
That's still a lot though, I got my case on sale for $40.
I'm pretty positive any standard DDR4 should work, but this is my first build so I don't know a whole lot.
Wow, that case is $1199!?
I'm pretty sure any DDR4 at 3200, 3000, 2800, 2666, 2400, and 2133 MHz should work at a max of 64 gb in total. That's what the manual says. It also says that it works with 2 , 4 , 8 , and 16 gb sticks of DDR4 .
Thanks, the 290 exceeded my expectations besides the point that it runs pretty hot!
Where did you get that red case?