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Kangaroo2K1 I suggest that you purchase two 16 GB DIMM kid instead of four 8 GB DIMM kit. This way, you'll have the option to upgrade beyond 32 GB in the future. Also, your motherboard is dual channel, so there is no advantage to selecting four chips instead of two.
CORSAIR Vengeance LPX 32GB (2 x 16GB) 288-Pin DDR4 SDRAM DDR4 2400
$224.99
https://www.newegg.com/Product/Product.aspx?Item=N82E16820236023
Personally I'd prefer installing a M.2 2280 form factor SSD directly onto the motherboard, instead of running a SATA cable to the more traditional 2.5" drive. The performance and price would be the same, but it makes for a cleaner looking build, if you care about such things. Also, if your case supports mounting 2.5" drives behind the motherboard tray, you could switch the hard drive from the 3.5" Western Digital for a Hitachi (aka HGST) 2.5" TravelStar (9.5mm height). Your case is very inexpensive, so it's entirely possible that you can mount drives back there, which means you'd be better sticking with the 3.5" drive. These last two ideas are fluff and just throwing ideas at you. Regardless, your build already looks good.