Best version of windows server 2008 r2?

[maximilion2]

Well i am going to make a server and i changed to windows server 2008 r2 but i don't know and i was hoping you tell me what

is the best version and most expensive?

Windows Server 2008 r2 Web Edition

Windows Server 2008 r2 Standard Edition

Windows Server 2008 r2 Enterprise Edition

Windows Server 2008 r2 Datacenter Edition

Windows Server 2008 r2 Foundation Edition

[MixMasteR]

Windows Server 2008 r2 Web Edition

 

OR

 

 

Windows Server 2008 r2 Standard Edition

[maximilion2]

I though that datacenter is the best cause it's the most expensive and also it includes all..

Also what install i must do full or core?