What's your budget? This would be able to play Skyrim on Ultra.

Based on what you've provided this is the route I would go:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor (£78.79 @ Aria PC)
Motherboard: *MSI H81M-P33 Micro ATX LGA1150 Motherboard (£32.17 @ Scan.co.uk)
Memory: *G.Skill Value Series 4GB (1 x 4GB) DDR3-1333 Memory (£25.77 @ Ebuyer)
Storage: *Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£35.94 @ Aria PC)
Video Card: XFX Radeon R9 270 2GB Double Dissipation Video Card (£109.52 @ Scan.co.uk)
Case: Cooler Master N200 MicroATX Mid Tower Case (£29.04 @ Scan.co.uk)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£46.99 @ Amazon UK)
Optical Drive: *Samsung SH-224DB/BEBE DVD/CD Writer (£10.46 @ Aria PC)
Total: £368.68
Prices include shipping, taxes, and discounts when available
*Lowest price parts chosen from parametric criteria
Generated by PCPartPicker 2014-12-27 01:18 GMT+0000