I have a budget of $1550 for this PC and I will explain some of the choices:
PC Use: Play and stream csgo, tf2, possibly some other new games; general drawing in Photoshop for fun (not content producing)* and other Adobe software, various web browsing
PCPartPicker: https://pcpartpicker.com/list/pVChGf
CPU - Intel i5 7600k: 7700k not needed since I am not a professional streamer and as Linus explains in https://youtu.be/toZ_t88bPBU?t=2m24s
CPU Cooler - Noctua NH-U9S: biggest Noctua air-cooler that can fit in the case; water cooling is too much effort for me
Motherboard - Asus TUF Z270 Mark 2: Only chose this for design choices and Z270 chip-set
RAM - Kingston Fury 2x8Gb 2133: I prefer Kingston over other memory companies
HDD - Seagate 2TB 3.5" 7200 RPM: I currently have no other hard drive to put in this
SSD - WD Blue 250 Gb M.2-2280 + Silverstone ECM21 M.2 to PCI-E X4 Card: Storage for games and M.2 as Linus explains in https://youtu.be/ItMY3WHHowQ?t=3m35s
GPU - Asus GTX 1070: Run games fast and stream
Case - Corsair Spec-Alpha: Yellow case under $100, nice angular design
PSU - EVGA Supernova G2 650W 80+ Gold: 80+ Gold efficiency, newer G2 lineup, possible headroom for future-proofing
OS - Windows 10: Still unsure of choosing this or 7, more towards 10 for it being newer
Network Card - Asus PCE-AC56 Wireless Card: I need a wireless card since I can't run an Ethernet cable to a room that is not next to mine
Monitor - AOC G2260VWQ6: 75 HZ, Full HD resolution
Please don't criticize me of my decisions being poor, I'm a freshman in high school and have the highest knowledge out of computers of everyone in my grade