That's good,
So I'd say the case, Cooler (as long as its got 1155 fittings), PSU and Hard drives can be carried across, no problems.
So really you'll be needing only a few bits. But the important ones.
YOUR BASKET
1 x
Powercolor Radeon R9 280X TurboDUO 3072MB GDDR5 PCI-Express Graphics Card £229.99
1 x
Intel Core i5-4690K 3.50GHz (Devil's Canyon) Socket LGA1150 Processor - Retail £189.95
1 x
Gigabyte Z97X-Gaming 7 Intel Z97 (Socket 1150) DDR3 ATX Motherboard £139.99
1 x
Intel 320 Series 120GB Internal SSD SATA 3GB/s 2.5" 7mm (SSDSA2BW120G3) £59.99
Total : £629.52 (includes shipping : £8.00).
New CPU, RAM, GPU and SSD.
The board may look high spec and the RAM may look missing. But the RAM (which is great stuff) comes free with that motherboard. Its only £5 more than a low spec motherboard + the same RAM, so why not.
The GPU comes with a free games voucher.
The SSD is a great choice for that money. This will obviously replace your HDD as the boot drive and the HDD will become just a storage drive. This will mean re-installing all programs again, which is good for performance.
It is also a fraction of your budget, so may I suggest looking at a new case/PSU/cooler too.
YOUR BASKET
1 x
BitFenix Ronin Tower Case - Black £69.95
1 x
SuperFlower Golden Green HX 550W "80 Plus Gold" Power Supply - Black £55.99
1 x
Alpenföhn Matterhorn Pure Edition CPU Cooler £29.99
Total : £167.63 (includes shipping : £9.75).
Much better.
THoughts?