Help me upgrade my PC

Minimum budget
PCPartPicker part list: http://pcpartpicker.com/p/3onlt
Price breakdown by merchant: http://pcpartpicker.com/p/3onlt/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3onlt/benchmarks/

CPU: AMD Athlon X4 750K 3.4GHz Quad-Core Processor ($79.18 @ OutletPC)
Motherboard: ASRock FM2A55M-VG3+ Micro ATX FM2+ Motherboard ($42.99 @ Newegg)
Memory: Kingston Blu 4GB (1 x 4GB) DDR3-1600 Memory ($34.99 @ Best Buy)
Total: $157.16
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-28 11:33 EDT-0400)

Mid-range performance.

PCPartPicker part list: http://pcpartpicker.com/p/1RlVT
Price breakdown by merchant: http://pcpartpicker.com/p/1RlVT/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1RlVT/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($112.99 @ NCIX US)
Motherboard: Gigabyte GA-970A-DS3P ATX AM3+ Motherboard ($64.99 @ Newegg)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($67.50 @ Newegg)
Total: $245.48
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-28 11:24 EDT-0400)

High end budget (no overclocking)

PCPartPicker part list: http://pcpartpicker.com/p/3A42t
Price breakdown by merchant: http://pcpartpicker.com/p/3A42t/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3A42t/benchmarks/

CPU: Intel Core i5-4440 3.1GHz Quad-Core Processor ($194.99 @ Newegg)
Motherboard: MSI H87-G43 ATX LGA1150 Motherboard ($74.79 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($79.99 @ Newegg)
Total: $329.77
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-28 11:28 EDT-0400)

Maximum budget (overclocking) Aftermarket CPU Cooler required for overclocking, stock cooler will be okay until you can afford that upgrade.

PCPartPicker part list: http://pcpartpicker.com/p/15jHm
Price breakdown by merchant: http://pcpartpicker.com/p/15jHm/by_merchant/
Benchmarks: http://pcpartpicker.com/p/15jHm/benchmarks/

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($229.98 @ OutletPC)
Motherboard: ASRock Z87 Pro4 ATX LGA1150 Motherboard ($94.99 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($72.00 @ Newegg)
Total: $396.97
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-28 11:30 EDT-0400)