Video Card: Galaxy GTX 660 2GB
CPU: AMD FX-4300 3.8GHz
Memory: 8GB Corsair Vengeance 1600MHz $53
Motherboard: ASUS M5A97 AM3+ Board
Power Supply: RAIDMAX Hybrid 2 530W PSU
Larger HD
1TB Toshiba HDD 7200RPM
Optical Drive: LG Optical Drive
Case: NZXT Source 210 White
Case Fan: 120mm CM fan (No LED)
That should help you run skyrim and some other games on medium settings. That should fit your budget.