First build need help

I like it overall, my only tweak would be the memory and the SSD. CL16 at a JEDEC frequency isn't very good in my opinion. You can get this for the same price, DDR4-3200 at the same timings: https://www.microcenter.com/product/481738/gskill-ripjaws-v-16gb-(2-x-8gb)-ddr4-3200-pc4-25600-cl16-dual-channel-desktop-memory-kit-f4-3200c16d-16gvkb---black

For the M.2, go for an NVME drive. You'll get a significance performance gain from it. We have an Inland brand NVME for the same price as the Samsung: https://www.microcenter.com/product/600422/inland-premium-1tb-ssd-3d-nand-m2-2280-pcie-nvme-30-x4-internal-solid-state-drive

Samsung is always a top tier NVME and we have drives from them as well: https://www.microcenter.com/product/601600/samsung-970-evo-1tb-ssd-v-nand-m2-2280-pcie-nvme-30-x4-internal-solid-state-drive