First time submitting one of these :O but I think it should suit what you need, I tried to make this as high spec'd as possible for you budget, I hope it helps!
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | AMD Phenom II X4 965 Black 3.4GHz Quad-Core Processor | - |
| Motherboard | Gigabyte GA-990FXA-UD3 ATX AM3+ Motherboard | $102.98 @ Newegg |
| Memory | Corsair XMS3 8GB (2 x 4GB) DDR3-1333 Memory | $42.99 @ Micro Center |
| Storage | Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive | $84.99 @ SuperBiiz |
| Video Card | Sapphire Radeon R7 240 4GB Video Card | $77.98 @ Newegg |
| Case | Diablotek DIAMOND ATX Mid Tower Case w/400W Power Supply | $29.99 @ Micro Center |
| Optical Drive | Samsung SH-224DB/BEBE DVD/CD Writer | $17.98 @ OutletPC |
| Operating System | Microsoft Windows 7 Home Premium SP1 OEM (64-bit) | $86.75 @ OutletPC |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $493.66 | |
| Mail-in rebates | -$50.00 | |
| Total | $443.66 | |
| Generated by PCPartPicker 2015-08-11 07:50 EDT-0400 |