building a new pc, please help

Supahos

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PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-7700K 4.2GHz Quad-Core Processor ($338.89 @ OutletPC)
CPU Cooler: CRYORIG H5 Ultimate 76.0 CFM CPU Cooler ($56.49 @ OutletPC)
Motherboard: Asus STRIX Z270-E GAMING ATX LGA1151 Motherboard ($189.99 @ SuperBiiz)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-2666 Memory ($94.99 @ Newegg)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive ($97.88 @ OutletPC)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($69.89 @ OutletPC)
Video Card: EVGA GeForce GTX 1080 8GB FTW Gaming ACX 3.0 Video Card ($589.99 @ Newegg)
Case: NZXT S340 (Black/Red) ATX Mid Tower Case ($59.99 @ B&H)
Power Supply: SeaSonic 650W 80+ Gold Certified Semi-Modular ATX Power Supply ($69.99 @ Newegg)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($88.58 @ OutletPC)
Software: Microsoft Office Home and Student 2016 Software ($115.00 @ Amazon)
Monitor: Asus VG248QE 24.0" 1920x1080 144Hz Monitor ($267.99 @ B&H)
Total: $2039.67
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-02-24 06:47 EST-0500


Cheaper and better memory, cheaper and equal power supply. Spent most of the difference on a much better CPU cooler. Saved a few bucks for a tiny bit better build.
 
Solution
For your first PC build I would suggest to skip overclocking. It isn't required to get good performance and to game at high settings.

SSD - Fine, but overpriced. SK Hynix, Crucial MX300 or Sandisk X400 are good options as well.
PSU - Look toward the newer G3 over the older EVGA G2.
MONITOR - Instead of 1080 resolution at 144Hz, consider 1440 resolution on a larger display.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-7700 3.6GHz Quad-Core Processor ($308.49 @ OutletPC)
Motherboard: Asus PRIME B250M-A Micro ATX LGA1151 Motherboard ($83.74 @ SuperBiiz)
Memory: G.Skill Aegis 16GB (2 x 8GB) DDR4-2400 Memory ($88.99 @ Newegg)
Storage: SK hynix SL308 500GB 2.5" Solid State Drive ($143.99 @ SuperBiiz)
Storage: Western Digital BLACK SERIES 2TB 3.5" 7200RPM Internal Hard Drive ($123.89 @ OutletPC)
Video Card: EVGA GeForce GTX 1080 8GB Superclocked Gaming ACX 3.0 Video Card ($589.99 @ Newegg)
Case: Fractal Design Define R5 (Titanium) ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: EVGA SuperNOVA G3 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($89.99 @ B&H)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($89.99 @ NCIX US)
Software: Microsoft Office Home and Student 2016 Software ($115.00 @ Amazon)
Monitor: Asus VG248QE 24.0" 1920x1080 144Hz Monitor ($267.99 @ B&H)
Total: $1982.05


Or AMD Ryzen..

PCPartPicker part list / Price breakdown by merchant

CPU: AMD RYZEN 7 1700 3.0GHz 8-Core Processor ($329.00 @ Amazon)
Motherboard: Asus PRIME X370-PRO ATX AM4 Motherboard ($170.00 @ Amazon)
Memory: G.Skill Ripjaws 4 Series 16GB (2 x 8GB) DDR4-3000 Memory ($96.99 @ Newegg)
Storage: SK hynix SL308 500GB 2.5" Solid State Drive ($143.99 @ SuperBiiz)
Storage: Western Digital BLACK SERIES 2TB 3.5" 7200RPM Internal Hard Drive ($123.89 @ OutletPC)
Video Card: EVGA GeForce GTX 1080 8GB Superclocked Gaming ACX 3.0 Video Card ($589.99 @ Newegg)
Case: Fractal Design Define R5 (Titanium) ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: EVGA SuperNOVA G3 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($89.99 @ B&H)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($89.99 @ NCIX US)
Software: Microsoft Office Home and Student 2016 Software ($115.00 @ Amazon)
Monitor: Asus VG248QE 24.0" 1920x1080 144Hz Monitor ($267.99 @ B&H)
Total: $2096.82
 


Sorry. I had the wrong one in those builds. Check the link below. The ASUS 27" 2k is pretty solid at 75Hz. Really depends on what size display you are after...

http://pcpartpicker.com/products/compare/C4Crxr,TwzZxr,7TrcCJ,YZn2FT/
 
The Z270 chipset is meant for multiple GPUs and to be paired with a K series CPU for overclocking (like the i7-7700k you originally posted). The B250 chipset I recommended is a better pairing for the non-K series CPU. There are no limitations with B250 (or H270) as long as you are good with no overclocking and will not be running multiple GPUs.
 
"Future proofing" is not a real thing, but yeah... pretty much. No one can predict their processing needs for years down the road, but you are going with the highest option available to you and there will be no tangible upgrade paths past an overclocked i7.

That EVGA 850w will set you up nicely to add a second GTX 1080 in SLI if / when you want to upgrade graphics. The newer EVGA G3 is available for roughly the same cost and I would recommend that over the G2 just for currency sake.

https://pcpartpicker.com/product/PvDzK8/evga-supernova-g3-850w-80-gold-certified-fully-modular-atx-power-supply-220-g3-0850