Ok. Lets break things down.
CPU - 2200G vs 3200G - Not a lot of difference (especially after overclocking). The 3200G is manufactured on a 12nm process whereas the 2200G is 14nm. I'd say the 3200G would be 10% faster. I think the 3200G is worth the extra $4 here.
Mobo - same pick.
RAM - My kit is faster and cheaper
Storage - I'd go with your WD Blue 500GB if you have the funds.
Case - I don't like the Q300L because it has an acrylic side panel and...other smaller factors
PSU - The CXM 550 is a good choice. But not worth the price premium. For nearly the same cost as the CXM-550, the
TXM-550 is far better
Wifi adapter - meh. If you need WiFi, this is how you get it.
Monitor - the LG 24MP59G is FAR better and larger.
Keyboard/mouse/headphones - do you need to actually buy these things?