Windows 2003 Standard 64bit vs non-64bit

Ok I am going to move to Windows 2003 server standard to host some game/web servers. My question is about the versions. They server will be hosting a Web server(IIS), a game server (HLDS2), and a teamspeak server. The server will be a Dell poweredge SC1425 which has 2x2.8Ghz Intel Xeon processors. What would the advantages/disadvantages be in chooseing Windows 2003 x64 edition over the regular edition?

 

 

 

 

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