right, gonna assume you play GW2 most of the time, all mmos are more cpu bound above all else, new gpu will boost it for sure, but cpu has greater gains.
will say this, with your old mobo and cpu, i can tell the RAM for it is very expensive or hard to get hold of, i think it was DDR2, which arent made any more.
im also gonna assume you might own a graphics card already
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU: Intel Core i5-4570 3.2GHz Quad-Core Processor (£151.99 @ Aria PC)
Motherboard: MSI H87M-G43 Micro ATX LGA1150 Motherboard (£68.50 @ Dabs)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£41.77 @ Amazon UK)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply (£49.83 @ Dabs)
Total: £312.09
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-26 15:13 BST+0100)