Most Intel mini-ITX mobo's have iffy reviews, so I selected a good one to fit into the BitFenix case:
[url=http://pcpartpicker.com/p/RQQt]PCPartPicker part list[/url] / [url=http://pcpartpicker.com/p/RQQt/by_merchant/]Price breakdown by merchant[/url] / [url=http://pcpartpicker.com/p/RQQt/benchmarks/]Benchmarks[/url]
[b]CPU:[/b] [url=http://pcpartpicker.com/part/intel-cpu-bx80637i53570k]Intel Core i5-3570K 3.4GHz Quad-Core Processor[/url] ($219.99 @ Amazon)
[b]Motherboard:[/b] [url=http://pcpartpicker.com/part/asus-motherboard-p8z77ideluxewd]Asus P8Z77-I DELUXE/WD Mini ITX LGA1155 Motherboard[/url] ($174.99 @ Newegg)
[b]Memory:[/b] [url=http://pcpartpicker.com/part/gskill-memory-f31600c8d8gab]G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory[/url] ($64.99 @ Newegg)
[b]Video Card:[/b] [url=http://pcpartpicker.com/part/sapphire-video-card-100354oc2l]Sapphire Radeon HD 7870 GHz Edition 2GB Video Card[/url] ($204.99 @ Newegg)
[b]Case:[/b] [url=http://pcpartpicker.com/part/bitfenix-case-bfcpro300rrxkrrp]BitFenix Prodigy (Red) Mini ITX Tower Case[/url] ($101.98 @ Newegg)
[b]Power Supply:[/b] [url=http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9]XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply[/url] ($69.99 @ Newegg)
[b]Total:[/b] $836.93
[i](Prices include shipping, taxes, and discounts when available.)[/i]
[i](Generated by PCPartPicker 2013-04-20 04:31 EDT-0400)[/i]
* This is about the minimum that I'd do for an Intel build for gaming. You could change the CPU to an i5 3350p (no integrated GPU) and save about $40 off, but you'd lose any OC'ing down the road if you desire that option.
* GPU is good, but personally I'd go with a cheaper (and more flexible case) to give you more bang for the buck when it comes to gaming, IMHO.
*AMD's options are limited to FM2 socket, which limits you to their APU's. This isn't a bad thing too much, but the socket will probably limit your upgrade path, if you end up using that option. Since this socket has a very limited upgrade path, I have a bit harder time recommending it over the Intel option. Obviously you can build an AMD system and still have a viable gamer for less than my above build.
With that in mind, here's an AMD system with the BitFenix case:
[url=http://pcpartpicker.com/p/RQTt]PCPartPicker part list[/url] / [url=http://pcpartpicker.com/p/RQTt/by_merchant/]Price breakdown by merchant[/url] / [url=http://pcpartpicker.com/p/RQTt/benchmarks/]Benchmarks[/url]
[b]CPU:[/b] [url=http://pcpartpicker.com/part/amd-cpu-ad580kwohjbox]AMD A10-5800K 3.8GHz Quad-Core Processor[/url] ($123.74 @ Amazon)
[b]Motherboard:[/b] [url=http://pcpartpicker.com/part/asrock-motherboard-fm2a85xitx]ASRock FM2A85X-ITX Mini ITX FM2 Motherboard[/url] ($103.98 @ Newegg)
[b]Memory:[/b] [url=http://pcpartpicker.com/part/gskill-memory-f31866c9d8gab]G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory[/url] ($64.99 @ Newegg)
[b]Video Card:[/b] [url=http://pcpartpicker.com/part/sapphire-video-card-1003522l]Sapphire Radeon HD 7950 3GB Video Card[/url] ($275.66 @ Newegg)
[b]Case:[/b] [url=http://pcpartpicker.com/part/bitfenix-case-bfcpro300rrxkrrp]BitFenix Prodigy (Red) Mini ITX Tower Case[/url] ($101.98 @ Newegg)
[b]Power Supply:[/b] [url=http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9]XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply[/url] ($69.99 @ Newegg)
[b]Total:[/b] $740.34
[i](Prices include shipping, taxes, and discounts when available.)[/i]
[i](Generated by PCPartPicker 2013-04-20 04:41 EDT-0400)[/i]
Now if you would change the case you could have:
[url=http://pcpartpicker.com/p/RQUG]PCPartPicker part list[/url] / [url=http://pcpartpicker.com/p/RQUG/by_merchant/]Price breakdown by merchant[/url] / [url=http://pcpartpicker.com/p/RQUG/benchmarks/]Benchmarks[/url]
[b]CPU:[/b] [url=http://pcpartpicker.com/part/intel-cpu-bx80637i53570k]Intel Core i5-3570K 3.4GHz Quad-Core Processor[/url] ($219.99 @ Amazon)
[b]Motherboard:[/b] [url=http://pcpartpicker.com/part/asrock-motherboard-z77pro3]ASRock Z77 Pro3 ATX LGA1155 Motherboard[/url] ($94.99 @ Amazon)
[b]Memory:[/b] [url=http://pcpartpicker.com/part/gskill-memory-f31866c9d8gab]G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory[/url] ($64.99 @ Newegg)
[b]Video Card:[/b] [url=http://pcpartpicker.com/part/sapphire-video-card-1003522l]Sapphire Radeon HD 7950 3GB Video Card[/url] ($275.66 @ Newegg)
[b]Case:[/b] [url=http://pcpartpicker.com/part/corsair-case-200r]Corsair 200R ATX Mid Tower Case[/url] ($49.99 @ Newegg)
[b]Power Supply:[/b] [url=http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9]XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply[/url] ($69.99 @ Newegg)
[b]Total:[/b] $775.61
[i](Prices include shipping, taxes, and discounts when available.)[/i]
[i](Generated by PCPartPicker 2013-04-20 04:44 EDT-0400)[/i]
So with the last Intel build you get:
* More flexibility with the setup.
* Better gaming system (mainly because of GPU upgrade) for less!
Sorry for the long post, but I find it easier to peruse a build this way, instead of always having to click on a link and have to come back to see the rest of the comments.