PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Pentium G3258 3.2GHz Dual-Core Processor | $64.99 @ SuperBiiz |
| Motherboard | MSI H81M-E33 Micro ATX LGA1150 Motherboard | $45.98 @ OutletPC |
| Memory | G.Skill Sniper Series 8GB (1 x 8GB) DDR3-1600 Memory | $51.99 @ Newegg |
| Storage | Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive | $44.99 @ Best Buy |
| Video Card | Sapphire Radeon R7 260X 2GB Video Card | $94.99 @ Newegg |
| Case | NZXT Source 210 Elite (Black) ATX Mid Tower Case | $47.99 @ SuperBiiz |
| Power Supply | Corsair CX 500W 80+ Bronze Certified Semi-Modular ATX Power Supply | $39.99 @ Newegg |
| Operating System | Microsoft Windows 8.1 (OEM) (64-bit) | $87.89 @ OutletPC |
| Wireless Network Adapter | Gigabyte GC-WB867D-I 802.11a/b/g/n/ac PCI-Express x1 Wi-Fi Adapter | $29.98 @ OutletPC |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $548.79 | |
| Mail-in rebates | -$40.00 | |
| Total | $508.79 | |
| Generated by PCPartPicker 2015-04-05 23:44 EDT-0400 |
Includes everything you asked for. He'll be able to play some other games too if he desires, so it's not restricted to Minecraft. If you want things to load more snappier, then replace the 1TB HDD with a Crucial MX100 128GB for roughly $65.
If you want to go cheaper which is 100% possible, you can, but this is a nice build that would last him for a couple of years with minecraft. There's also a nice upgrade path for his processor and graphics card as well. Any questions, ask away.