Okay, im buying this pc soon: http://www.overclockers.co.uk/showproduct.php?prodid=FS-180-OK&tool=5 And I was just wandering if it was upgradeable? i.e. Would I be able to get a much better cpu (i.e. intel i7/i5 equivalent?) and more ram? (6-8gb?) and would I be able to get a much better graphics card?