Looking for advice on my mid range gaming rig

[Nyehh]

Location: US
Budget: 800$

Already have: OS, optical drive, storage, case, CPUcooler and all other peripherals


CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($209.99 @ Newegg)
Motherboard: ASRock Z77 Pro3 ATX LGA1155 Motherboard ($102.55 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($72.99 @ Newegg)
Video Card: PowerColor Radeon HD 7870 XT 2GB Video Card ($253.98 @ Newegg)
Power Supply: Corsair Builder 600W 80 PLUS Certified ATX12V Power Supply ($69.98 @ Amazon)
Total: $709.49
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-14 16:47 EDT-0400)

What can i do to improve or reduce the cost? 800 is the budget but if i can stay under while getting the same result would be awesome. Thank you in advance.

 

[X79]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
Motherboard: ASRock Z75 Pro3 ATX LGA1155 Motherboard ($84.99 @ Amazon)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Video Card: PowerColor Radeon HD 7970 3GB Video Card ($329.99 @ NCIX US)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Newegg)
Total: $744.95
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-14 17:58 EDT-0400)

For a little over budget you could even get:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
Motherboard: ASRock Z75 Pro3 ATX LGA1155 Motherboard ($84.99 @ Amazon)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Video Card: Gigabyte GeForce GTX 770 2GB Video Card ($395.98 @ SuperBiiz)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Newegg)
Total: $810.94
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-14 18:00 EDT-0400)


Or with an even more high-end motherboard, getting things right to the limit:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
Motherboard: Gigabyte GA-Z77X-UD3H ATX LGA1155 Motherboard ($139.99 @ Amazon)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Video Card: PowerColor Radeon HD 7970 3GB Video Card ($329.99 @ NCIX US)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Newegg)
Total: $799.95
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-14 18:04 EDT-0400)


Could also go the other way and take away the OC'ing...

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570 3.4GHz Quad-Core Processor ($194.99 @ Amazon)
Motherboard: MSI B75A-G43 ATX LGA1155 Motherboard ($78.98 @ SuperBiiz)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Newegg)
Video Card: Sapphire Radeon HD 7950 3GB Video Card ($269.99 @ Newegg)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Newegg)
Total: $663.94
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-14 18:07 EDT-0400)

 

[catswold]

How about a Powercolor 7870 Myst. Edition? Newegg open box for $199

http://www.newegg.com/Product/Product.aspx?Item=N82E16814131484R