Upgrading system for gaming

Approximate Purchase Date: this week

Budget Range: (e.g.: 300-400) Before / After Rebates; Before / After Shipping

Don't really want to spend more the $1200

System Usage from Most to Least Important:

Gaming

Are you buying a monitor:

yes, but I will look into that later on my own
It will be 1080p 144Hz

Parts to Upgrade:

CPU Mobo RAM GPU SSD

I'm reusing:
case: antec three hundred illusion https://pcpartpicker.com/product/KMNp99/antec-case-threehundredillusion
PSU: CORSAIR TX Series CMPSU-750TX 750W http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
cooler: coolermaster 212 evo

Do you need to buy OS:

yes, I'll buy windows 10 64bit

Preferred Website(s) for Parts:

newegg
amazon

Location:

bay area california

Overclocking: Yes (never have done it before but I have heard it is straightforward)

SLI or Crossfire: Not planning on it

Your Monitor Resolution: 1920x1080

Additional Comments:

This computer is for gaming @ 1080p 144Hz. I would like to play at the highest settings at this resolution with hopefully 150-200fps (for those of you that say fps > refresh rate doesn't matter - I'm sorry that's wrong I can get sources if you want me to but I would rather not argue about it). I will have a second monitor 1080p but just for having web/discord/reddit/etc. open during games (I don't know if this affects performance or not so I thought I would mention it).

I also stream on twitch just for fun occasionally.

Games I play: Dota2, CSGO, rainbow 6 siege, skyrim, Squad (alpha, not optimized atm), Civ 6, rocket league, overwatch, etc.

Some questions:

Is my cooler master 212 evo compatible with this?

How is my Mobo choice? I saw something about the SATA ports:
4 x SATA 6.0 Gb/s ports (gray)** ** These SATA ports are for data hard drivers only. ATAPI devices are not supported.

Does this mean that I cannot use my optical drive with this mobo? This is important to me because I like to load up older games on CDs now and then.

I don't really know how to pick out a mobo. Here is another one I looked at that is more expensive. Would this offer me anything over my current choice?

MSI MSI Gaming Z170A GAMING M7: http://www.newegg.com/Product/Product.aspx?Item=N82E16813130872&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-BD%20Industries%20LLC-_-na-_-na-_-na&cm_sp=&AID=10440897&PID=7718204&SID=pchound

How is my current PSU? Is it adequate to keep using or do I need to purchase a better one?

Any other advice is welcome of course (spending too much/too little, or is there a better alternative that would make sense price/performance wise).

List of parts (purchased for $0 means I already have this part):

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor ($219.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (Purchased For $0.00)
Motherboard: Asus Z170 PRO GAMING ATX LGA1151 Motherboard ($121.99 @ Newegg)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-3000 Memory ($79.99 @ Newegg)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive ($79.99 @ Newegg)
Storage: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For $0.00)
Video Card: EVGA GeForce GTX 1070 8GB FTW Gaming ACX 3.0 Video Card ($420.81 @ Amazon)
Case: Antec Three Hundred Illusion ATX Mid Tower Case (Purchased For $0.00)
Total: $922.77
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-11-27 21:40 EST-0500

I also have an optical drive I will be using. My PSU is not on that list because I could not find it on the website: CORSAIR TX Series CMPSU-750TX 750W http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006

I came up with this build on my own without knowing much about hardware so let me know if this build makes sense or if there is anything that I should change. Thanks a lot for any help!