I'm in a similar circumstance myself, and am building mid-June with the same budget, near enough. This is what I would go for, except that the case and motherboard are only in there to hold the price, as if that's what I would spend on them for example, just to manipulate the grand total - so you might want a certain looking case etc. I will admit I'm not big on building, and so my knowledge on branding etc is next to nothing, although as I said, this is what I would go for:
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-4440 3.1GHz Quad-Core Processor | £142.46 @ Ebuyer |
| Motherboard | MSI H81M-P33 Micro ATX LGA1150 Motherboard | £32.36 @ Scan.co.uk |
| Memory | G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory | £50.77 @ Amazon UK |
| Storage | Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive | £42.95 @ CCL Computers |
| Video Card | MSI Radeon R9 290 4GB TWIN FROZR Video Card | £236.99 @ Novatech |
| Case | NZXT Source 210 Elite (Black) ATX Mid Tower Case | £35.99 @ Aria PC |
| Power Supply | Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply | £57.98 @ Amazon UK |
| Optical Drive | Samsung SH-224DB/BEBE DVD/CD Writer | £10.50 @ CCL Computers |
| Operating System | Microsoft Windows 8.1 (OEM) (64-bit) | £75.54 @ Aria PC |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | £685.54 | |
| Generated by PCPartPicker 2015-04-23 16:39 BST+0100 |