With that kind of money there is no upgrading needed. Its called a new gaming rig. I will link you to two building sites so you can get an idea about what you want. Then take that info and build your rig.
These sites have a configurater that you can choose everything you want to build a gaming rig. Then with parts list you got from playing around then order the parts and build it your self.
They are in the US so if you know the euro vs what the US dollar is then you should not have any problems figuring out how much you have spent. I hope this helps you and good luck on building a new rig.http://www.cyberpowerpc.com/?utm_source=bing&utm_medium=cpc&utm_campaign=New+CyberPowerPChttp://www.ibuypower.com/