The best Web Server would be Microsoft Windows Server 2008 R2 Web Server. You need someone with Windows Hosting to really use it. Who the best one is, don't know
No, the processor should be a server-class processors like Xeon 5600 series. 64-bit Web Edition is fine although there's not a great deal of money saved over the 2008 R2 Standard. Enterprise or Datacentre Editions don't bring many advantages to the average user.
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