I think you'd get more responses if you were more specific. Is motherboard included in that $700? Do you have any parts already?
I'll assume you need a motherboard too.
PCPartPicker part list:
http://pcpartpicker.com/p/hdzyLk
Price breakdown by merchant: http://pcpartpicker.com/p/hdzyLk/by_merchant/
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($209.99 @ Amazon)
Motherboard: Gigabyte GA-Z97X-SLI ATX LGA1150 Motherboard ($88.99 @ Newegg)
Video Card: EVGA GeForce GTX 970 4GB ACX 2.0 Video Card ($329.99 @ NCIX US)
Total: $628.97
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-21 22:07 EST-0500
If you don't need the motherboard for some reason, this is the best you could do under $700
PCPartPicker part list:
http://pcpartpicker.com/p/J9v8P6
Price breakdown by merchant: http://pcpartpicker.com/p/J9v8P6/by_merchant/
CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($299.99 @ Amazon)
Video Card: EVGA GeForce GTX 970 4GB ACX 2.0 Video Card ($329.99 @ NCIX US)
Total: $629.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-11-21 22:09 EST-0500