I assume you have a copy of Windows already??
These are the parts I would get:
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.amazon.co.uk/gp/product/B...A3L3J2S7ZZAKGN
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.amazon.co.uk/gp/product/B...A3P5ROKL5A1OLE
http://www.dabs.com/products/gigabyt...i-oc-952C.html
The total should come to around £650 including a 240GB Crucial M500 SSD.