Please Check this Computer for Compatibility

Solution
*No need for a Z270 board with a locked CPU and 2133MHZ Ram - pick up an H270 or B250 board for much less.
*Skylake and KabyLake benefit from dual channel RAM moreso than previous generations. A 2x4GB would be a smarter idea than a single 8GB module.
*A 240GB SSD will fill up fast if it's your only storage device. Make sure you pair it with an HDD.



While it's true they are available, I wouldn't recommend picking one up. There's always the potential they're already in use, have been stolen, have been purchased with a stolen credit card etc. Always buy your OS from official retailers or MS directly...
*No need for a Z270 board with a locked CPU and 2133MHZ Ram - pick up an H270 or B250 board for much less.
*Skylake and KabyLake benefit from dual channel RAM moreso than previous generations. A 2x4GB would be a smarter idea than a single 8GB module.
*A 240GB SSD will fill up fast if it's your only storage device. Make sure you pair it with an HDD.



While it's true they are available, I wouldn't recommend picking one up. There's always the potential they're already in use, have been stolen, have been purchased with a stolen credit card etc. Always buy your OS from official retailers or MS directly.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-7500 3.4GHz Quad-Core Processor ($188.89 @ OutletPC)
Motherboard: ASRock B250M-HDV Micro ATX LGA1151 Motherboard ($56.98 @ Newegg)
Memory: G.Skill NT Series 8GB (2 x 4GB) DDR4-2400 Memory ($57.99 @ Newegg)
Storage: Zotac T500 240GB 2.5" Solid State Drive ($69.99 @ Amazon)
Video Card: EVGA GeForce GTX 1050 Ti 4GB SC GAMING ACX 2.0 Video Card ($115.65 @ Amazon)
Case: Thermaltake Versa C22 RGB ATX Mid Tower Case ($59.99 @ SuperBiiz)
Power Supply: Corsair CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply ($29.99 @ Newegg)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($88.58 @ OutletPC)
Monitor: AOC I2269VW 21.5" 1920x1080 60Hz Monitor ($79.99 @ Best Buy)
Keyboard: Corsair K40 Wired Gaming Keyboard ($59.49 @ OutletPC)
Mouse: Corsair Harpoon RGB Wired Optical Mouse ($29.09 @ Amazon)
Total: $836.63
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-04-28 14:21 EDT-0400

$160 saving right off the top, with only positive impacts to performance (and you could put that money towards a better GPU).
 
Solution
While this list is more expensive than Barty's, it's significantly more powerful and is still cheaper than your original list.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-7500 3.4GHz Quad-Core Processor ($188.89 @ OutletPC)
Motherboard: ASRock B250M-HDV Micro ATX LGA1151 Motherboard ($61.98 @ Newegg)
Memory: G.Skill NT Series 8GB (2 x 4GB) DDR4-2400 Memory ($57.99 @ Newegg)
Storage: Sandisk SSD PLUS 240GB 2.5" Solid State Drive ($83.85 @ OutletPC)
Video Card: Gigabyte Radeon RX 580 8GB Gaming 8G Video Card ($219.99 @ SuperBiiz)
Case: Thermaltake Versa C22 RGB ATX Mid Tower Case ($59.99 @ SuperBiiz)
Power Supply: Corsair CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ Amazon)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($89.98 @ NCIX US)
Monitor: AOC I2269VW 21.5" 1920x1080 60Hz Monitor ($79.99 @ Best Buy)
Keyboard: Redragon K551 Wired Gaming Keyboard ($46.99 @ Amazon)
Mouse: Redragon Mammoth Wired Laser Mouse ($25.99 @ Amazon)
Total: $965.63
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-04-28 15:02 EDT-0400
 


I just wanted to make sure that OP gets a card that offers good price/performance and is compatible with their power supply. Since I already had a list that showed me what power supply they were planning to buy, I just went ahead and did it for them.
 
So RektSkrubz down voted me...

@RektSkrubz, you do realize that Tom's is a place where we should always place our best foot forward, right? Just because you can get Windows for $10 (and I know people whose licenses have been blacklisted because they did that), doesn't mean you should.

Here on Tom's, I believe it to be my responsibility to be as useful to the original poster as I can be. If that means they end up spending​ an extra $70 to avoid being labeled as a pirate, I'm okay with that.

While many don't call it pirating, buying activation codes that are copied off of OEM machines for a fraction of the actual price of activation is pirating in my book. Tom's does not allow pirating and many users will likely back me up in my stand that we shouldn't encourage it either.