First PC build - need opinions on parts.

[CowThing]

Edit: [B]Oops, I didn't see there was a dedicated PC Building thread, I've reposted to there.[/B]

Some info: I want to keep this build under $600. The PC is going to be used for gaming and game development.
I have these two builds, I got both from Choose My PC and asking some people. Problem is I've never built a PC before so I don't know which system would be better. Any opinions on which I should get? Is there anything I should change on either of them?

[U]Build 1:[/U]
[url=http://pcpartpicker.com/p/XMBvGX]PCPartPicker part list[/url] / [url=http://pcpartpicker.com/p/XMBvGX/by_merchant/]Price breakdown by merchant[/url]

[b]CPU:[/b] [url=http://pcpartpicker.com/part/amd-cpu-fd6300wmhkbox]AMD FX-6300 3.5GHz 6-Core Processor[/url] ($96.99 @ SuperBiiz)
[b]Motherboard:[/b] [url=http://pcpartpicker.com/part/gigabyte-motherboard-ga78lmtusb3]Gigabyte GA-78LMT-USB3 Micro ATX AM3+ Motherboard[/url] ($43.98 @ Newegg)
[b]Memory:[/b] [url=http://pcpartpicker.com/part/pareema-memory-md316d81610l1]Pareema 8GB (1 x 8GB) DDR3-1600 Memory[/url] ($40.99 @ Newegg)
[b]Storage:[/b] [url=http://pcpartpicker.com/part/seagate-internal-hard-drive-st1000dm003]Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive[/url] ($48.89 @ OutletPC)
[b]Video Card:[/b] [url=http://pcpartpicker.com/part/msi-video-card-gtx9602gd5toc]MSI GeForce GTX 960 2GB Video Card[/url] ($169.99 @ SuperBiiz)
[b]Case:[/b] [url=http://pcpartpicker.com/part/cooler-master-case-nse200kkn1]Cooler Master N200 MicroATX Mid Tower Case[/url] ($43.99 @ SuperBiiz)
[b]Power Supply:[/b] [url=http://pcpartpicker.com/part/evga-power-supply-100b10500kr]EVGA 500W 80+ Bronze Certified ATX Power Supply[/url] ($34.99 @ NCIX US)
[b]Operating System:[/b] [url=http://pcpartpicker.com/part/microsoft-os-885370635690]Microsoft Windows 8.1 OEM (64-bit)[/url] ($89.95 @ OutletPC)
[b]Total:[/b] $569.77
[i]Prices include shipping, taxes, and discounts when available[/i]
[i]Generated by PCPartPicker 2015-07-23 19:22 EDT-0400[/i]

[U]Build 2:[/U]
[url=http://pcpartpicker.com/p/MkCF6h]PCPartPicker part list[/url] / [url=http://pcpartpicker.com/p/MkCF6h/by_merchant/]Price breakdown by merchant[/url]

[b]CPU:[/b] [url=http://pcpartpicker.com/part/intel-cpu-bx80646i34160]Intel Core i3-4160 3.6GHz Dual-Core Processor[/url] ($112.99 @ SuperBiiz)
[b]Motherboard:[/b] [url=http://pcpartpicker.com/part/gigabyte-motherboard-gah81ms2h]Gigabyte GA-H81M-S2H Micro ATX LGA1150 Motherboard[/url] ($49.99 @ SuperBiiz)
[b]Memory:[/b] [url=http://pcpartpicker.com/part/pareema-memory-md316d81610l1]Pareema 8GB (1 x 8GB) DDR3-1600 Memory[/url] ($40.99 @ Newegg)
[b]Storage:[/b] [url=http://pcpartpicker.com/part/seagate-internal-hard-drive-st1000dm003]Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive[/url] ($48.89 @ OutletPC)
[b]Video Card:[/b] [url=http://pcpartpicker.com/part/xfx-video-card-r9280atdfd]XFX Radeon R9 280 3GB Double Dissipation Video Card[/url] ($149.99 @ Newegg)
[b]Case:[/b] [url=http://pcpartpicker.com/part/cooler-master-case-nse200kkn1]Cooler Master N200 MicroATX Mid Tower Case[/url] ($43.99 @ SuperBiiz)
[b]Power Supply:[/b] [url=http://pcpartpicker.com/part/evga-power-supply-100b10500kr]EVGA 500W 80+ Bronze Certified ATX Power Supply[/url] ($34.99 @ NCIX US)
[b]Operating System:[/b] [url=http://pcpartpicker.com/part/microsoft-os-885370635690]Microsoft Windows 8.1 OEM (64-bit)[/url] ($89.95 @ OutletPC)
[b]Total:[/b] $571.78
[i]Prices include shipping, taxes, and discounts when available[/i]
[i]Generated by PCPartPicker 2015-07-23 19:22 EDT-0400[/i]