You're not building them a gaming PC. Just go for this:
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | AMD FX-6300 3.5GHz 6-Core Processor | $85.50 @ SuperBiiz |
| Motherboard | Asus M5A78L-M/USB3 Micro ATX AM3+ Motherboard | $42.20 @ SuperBiiz |
| Memory | Kingston 4GB (1 x 4GB) DDR3-1600 Memory | $25.11 @ SuperBiiz |
| Storage | OCZ ARC 100 120GB 2.5" Solid State Drive | $59.99 @ Amazon |
| Storage | Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive | $48.60 @ SuperBiiz |
| Case | Cooler Master N200 MicroATX Mid Tower Case | $39.60 @ SuperBiiz |
| Power Supply | Corsair CX 430W 80+ Bronze Certified Semi-Modular ATX Power Supply | $26.99 @ Newegg |
| Operating System | Microsoft Windows 8.1 (OEM) (64-bit) | $86.98 @ OutletPC |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $454.97 | |
| Mail-in rebates | -$40.00 | |
| Total | $414.97 | |
| Generated by PCPartPicker 2015-05-22 08:51 EDT-0400 |
Keep in mind a few options: