Yep, go for 21st century edition.
I have found some older translations with descriptive notation, and it's something you don't want to deal with IMO. 
My system
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I recently decided to buy Aron Nimzowitsch's my system.When i searched for it i found that their are many copies all similiar.My question is since the original is in german which copy has the best translation.I was wondering if anyone had a copy and their thoughts on it.