I was on a budget but I pretty much got an 8 core 4.ghz processor, 1gb gtx 650 nvidia graphics card and 16gb RAM + other stuff to build a PC apart from a hard drive for £400
Processor & Motherboard:
http://www.ebay.co.uk/itm/121019184545?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Graphics card:
http://www.ebay.co.uk/itm/281053924735?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
RAM:
http://www.ebay.co.uk/itm/290855220622?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
PSU:
http://www.ebay.co.uk/itm/280938715441?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Case:
http://www.ebay.co.uk/itm/200882879007?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Processor & Motherboard:
http://www.ebay.co.uk/itm/121019184545?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Graphics card:
http://www.ebay.co.uk/itm/281053924735?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
RAM:
http://www.ebay.co.uk/itm/290855220622?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
PSU:
http://www.ebay.co.uk/itm/280938715441?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Case:
http://www.ebay.co.uk/itm/200882879007?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649