I added up your totals, and done this build for you.
Your basketProduct Name	Qty	Price	Line Total
	Gainward GeForce GTX 580 "GOOD Edition" 1536MB GDDR5 PCI-Express Graphics Card		£347.99
(£289.99)	£347.99
(£289.99)
	Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor		£161.99
(£134.99)	£161.99
(£134.99)
	Asus P8Z68-V Intel Z68 (Socket 1155) DDR3 Motherboard		£130.00
(£108.33)	£130.00
(£108.33)
	XFX 850W Black Edition Modular Power Supply		£122.99
(£102.49)	£122.99
(£102.49)
	Crucial RealSSD M4 64GB 2.5" SATA 6Gb/s Solid State Hard Drive		£99.98
(£83.32)	£99.98
(£83.32)
	Fractal Design Define XL Full Tower Case - Black Pearl		£89.99
(£74.99)	£89.99
(£74.99)
	Microsoft Windows 7 Bundle - Home Premium 64 Bit		£68.40
(£57.00)	£68.40
(£57.00)
Options applied to the above product:
Western Digital Caviar Blue 500GB SATA 6Gb/s 16MB Cache - OEM (WD5000AAKX)		£32.99
(£27.49)	£32.99
(£27.49)
	Corsair XMS3 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX8GX3M2A1600C9)		£64.99
(£54.16)	£64.99
(£54.16)
	Thermalright Silver Arrow CPU Cooler (Socket LGA1366/LGA1155/LGA1156/LGA775/AM2/AM3)		£50.99
(£42.49)	£50.99
(£42.49)
	LG GH22NS70 22x DVD±RW SATA ReWriter (Black) - OEM		£16.99
(£14.16)	£16.99
(£14.16)
 		Sub Total :	£989.41
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout)	Shipping :	£16.85
VAT is being charged at 20.00%	VAT :	£201.25
 	Total :	£1,207.51
A 2500K is as fast as in gaming as a 2600K - 
http://www.anandtech.com/bench/Product/288?vs=287
The Fractel XL Tower is only £5 more than a R3.
The XFX PSU I selected is good,
http://www.hardwaresecrets.com/article/808
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=165
Also included the latest Z68 motherboard and a SSD