Here is 2 possible upgrades you can do. If you don't need a 480GB SSD you can pickup a 120GB or 250GB to save yourself some $$$ and upgrade the PSU & Case with it.

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CPU: [ Register or Signin to view external links. ] ($386.99 @ Amazon)
CPU Cooler: [ Register or Signin to view external links. ] ($12.99 @ Newegg)
Storage: [ Register or Signin to view external links. ] ($132.94 @ Jet)
Video Card: [ Register or Signin to view external links. ] ($228.98 @ Newegg)
Power Supply: [ Register or Signin to view external links. ] ($39.99 @ Newegg)
Total: $801.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-16 06:44 EDT-0400

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CPU: [ Register or Signin to view external links. ] ($386.99 @ Amazon)
CPU Cooler: [ Register or Signin to view external links. ] ($12.99 @ Newegg)
Storage: [ Register or Signin to view external links. ] ($49.99 @ B&H)
Video Card: [ Register or Signin to view external links. ] ($228.98 @ Newegg)
Case: [ Register or Signin to view external links. ] ($62.00 @ Newegg)
Power Supply: [ Register or Signin to view external links. ] ($55.98 @ Newegg)
Total: $796.93
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-16 06:38 EDT-0400

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Storage: [ Register or Signin to view external links. ] ($74.99 @ Newegg)
Video Card: [ Register or Signin to view external links. ] ($179.99 @ Newegg)
Case: [ Register or Signin to view external links. ] ($89.99 @ Newegg)
Power Supply: [ Register or Signin to view external links. ] ($64.99 @ B&H)
Total: $409.96

If you want a new CPU, get a Sandy Bridge or Ivy Bridge i5/i7. $385 for a locked i7 is overpriced, so don't buy new.