I wouldn't bother, honestly. The tech tree poster will only be good until the expansion, at which time more techs will be added. The collectors edition 'ship jewelry' is nice, but there's been talk of releasing that to the public in a later update, and the box's shininess will only captivate you for a few hours
Oh, and theres the desktop theme, but (as much as I like it) probably isn't worth 40$ if that's the only major incentive.
Save your money for the expansion pack
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