Enermax NAXN 500W 80+
MSI Z87-G45
2x G-SKILL DDR3-1333 2GB
Intel i5 4570
MSI GTX 760 TWIN FROZR
WDC 500GB 7200RPM SATA BLUE
Need a better psu.
1TB hard drives are only like $5-10 more than 500GB hard drives
You will want 2x4GB of RAM in a $1000 build.
The 4570 is a GREAT cpu and will not bottleneck anything.
You do not need a Z87 motherboard. I recommend a H97 motherboard.
The GTX760 is fine, but you can do better in a $1000 build.
joker50060's build above is a big step up, but I would even make some changes to his.
Do you need to buy windows? monitor? keyboard and mouse? It's important to know this.
I'm going to assume you at least need windows. Here is what I recommend if you do need windows, but not a monitor.
PCPartPicker part list:
http://pcpartpicker.com/p/fDdwkL
Price breakdown by merchant: http://pcpartpicker.com/p/fDdwkL/by_merchant/
CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($199.98 @ SuperBiiz)
Motherboard: ASRock H97 PRO4 ATX LGA1150 Motherboard ($76.66 @ Newegg)
Memory: A-Data XPG V2 8GB (2 x 4GB) DDR3-1866 Memory ($69.30 @ Newegg)
Storage: Crucial M500 120GB 2.5" Solid State Drive ($71.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($52.92 @ Amazon)
Video Card: EVGA GeForce GTX 770 2GB Dual Superclocked ACX Video Card ($309.99 @ Newegg)
Case: Corsair 300R ATX Mid Tower Case ($59.99 @ Micro Center)
Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($59.99 @ NCIX US)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $990.80
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-06-20 08:23 EDT-0400
If you do need a monitor, you can scrap the ssd.