Need a specific office build

[howtoraidherefor]

Approximate Purchase Date: e.g.: two weeks

Budget Range: $400-$500, without shipping.

System Usage from Most to Least Important: Office usage, multi-monitor though.

Are you buying a monitor: Already purchased.

Hey everyone, now that the above out is the way, I'd prefer a build that is AMD-based but has a dedicated GPU just in case. My main requirement is that I want to fit it inside an Aerocool M40(http://www.technic3d.com/news/images/News_Bilder_Listan/ae2.jpg)

I hope you guys can help me out on this one.

Thanks in advance!

 

[Blaise170]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-4130 3.8GHz Quad-Core Processor ($89.98 @ OutletPC)
Motherboard: Gigabyte GA-78LMT-S2 Micro ATX AM3+ Motherboard ($47.49 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-2133 Memory ($52.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($58.99 @ NCIX US)
Video Card: MSI Radeon HD 7790 1GB Video Card ($105.66 @ Newegg)
Case: Aerocool M40-BK MicroATX Mini Tower Case ($87.98 @ OutletPC)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($25.99 @ Newegg)
Optical Drive: Asus DRW-24F1ST DVD/CD Writer ($15.99 @ Newegg)
Total: $485.07
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-23 13:15 EST-0500)

 

[Beezy]

Radeon HD 7870 might still be cheaper on newegg for 103$ and its much much better! Its the msi brand HD 7870