This is basically the same as previously, with another case and cooler and a tad smaller power supply. And without Office:
PCPartPicker part list:
http://pcpartpicker.com/p/YdWgYJCPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor ($233.99 @ SuperBiiz)
CPU Cooler: Gelid Solutions CC-Siberian-01 51.9 CFM CPU Cooler ($9.88 @ OutletPC)
Motherboard: Gigabyte GA-Z170-HD3 ATX LGA1151 Motherboard ($87.98 @ Newegg)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory ($114.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($48.77 @ OutletPC)
Video Card: EVGA GeForce GTX 970 4GB SSC ACX 2.0+ Video Card ($308.99 @ NCIX US)
Case: Thermaltake VL80001W2Z ATX Mid Tower Case ($22.99 @ Micro Center)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($59.99 @ SuperBiiz)
Optical Drive: LG UH12NS30 Blu-Ray Reader, DVD/CD Writer ($39.89 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($85.49 @ OutletPC)
Keyboard: Gear Head KBL5925W Wireless Standard Keyboard w/Laser Mouse ($39.99 @ Amazon)
Speakers: Logitech Z200 0W 2ch Speakers ($24.89 @ SuperBiiz)
Total: $1077.84
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-04-14 13:45 EDT-0400
The next step would be cutting off some performance. A cheaper processor, a dual core i3-6320 @3.9 GHz would cut ~80 off. GTX 960 instead of 970 ~100. And a little smaller Seasonic PSU for ~20 less. That would be quite close to the $800 budget.