Alienware aurora r1 upgrade help

Hello i have an alienware aurora r1 and i would like to know if i should upgrade it or buy a new pc Intel I7 920 overclocked 3.2ghz 1gb hd 5770 9gb ddr3 ram 1333mhz 1tb hdd I record with an hdpvr and like to edit i also love to play games such as wow( world of warcraft) runescape, aion, and upcoming games i just want my pc to be ultra fast threw browsering internet such please help