Upgrading Gaming Computer with $1000

[Bruski]

I have a FX6800-e01 pre-built gaming computer and have $1000 to upgrade it with. Some info about the system as is:
http://www.cnet.com/products/gateway-fx6800-01e/
http://www.ascendtech.us/fx6800-01e-power-supply-ps-6451-2-450wt_i_cspgatwlps64512.aspx
I already have peripherals and would just be upgrading the computer components. I do not mind getting all new storage with a new OS either. Anyway, what parts do you recommend upgrading and what performance would you predict getting on todays games at 1080p (no overclock)? I don't even know if anything from my current computer should be reused, as it is getting old, but I'm new to this whole thing and I'll leave it up to you to give advice on that. Thank you very much, any feedback will be appreciated!

 

[Sintruder]

With $1k cash at your disposal, I would recommend you to build a completely new pc, instead of upgrading your really old rig. If you've got patience I would also suggest you to wait and see what amd has to offer with their Polaris graphics cards before you upgrade or build a new pc.

 

[BadActor]

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor ($244.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($24.88 @ OutletPC)
Motherboard: Gigabyte GA-Z170-HD3P ATX LGA1151 Motherboard ($99.99 @ Micro Center)
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-2133 Memory ($69.99 @ Newegg)
Storage: Samsung 850 EVO-Series 120GB 2.5" Solid State Drive ($64.88 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Directron)
Video Card: PowerColor Radeon R9 390 8GB Video Card ($259.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($44.99 @ Micro Center)
Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($48.99 @ NCIX US)
Optical Drive: Lite-On iHAS124-14 DVD/CD Writer ($14.88 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($87.95 @ OutletPC)
Total: $1011.52
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-02-14 14:43 EST-0500

 

[ScrewySqrl]

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Xeon E3-1230 V5 3.4GHz Quad-Core Processor ($247.99 @ SuperBiiz)
Motherboard: Gigabyte GA-X150M-PLUS WS Micro ATX LGA1151 Motherboard ($166.97 @ Newegg)
Memory: G.Skill NT Series 16GB (2 x 8GB) DDR4-2133 Memory ($65.99 @ Newegg)
Storage: Crucial BX100 250GB 2.5" Solid State Drive ($64.00 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Directron)
Video Card: XFX Radeon R9 380X 4GB DD XXX OC Video Card ($199.99 @ Newegg)
Case: Rosewill WolfStone ATX Mid Tower Case ($39.99 @ Newegg)
Power Supply: Rosewill 600W 80+ Gold Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($17.78 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($87.95 @ OutletPC)
Total: $980.64
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-02-14 14:45 EST-0500

hw I'd spend 1K