Is A Completely Balanced Signal Path Worth It?

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This is something that I've been contemplating for a few months now and I haven't been able to come to a conclusion on my own that satisfies my curiosity. By completely balanced I don't mean just XLR connections but a balanced differential signal path. So for instance if you started with a balanced processor such as the Anthem AVM 50 or D2v which have balanced stereo inputs and also used the Emo XPA-1's and the balanced stereo inputs of the Oppo bd 95 would it be a significant improvement over non balanced or single ended gear? This would obviously only for two channel playback and not apply to any HT applications. I know that the main benefit of using balanced components is better noise rejection and a lower noise floor. Most balanced components are significantly more expensive than their single ended non balanced counter parts. So is it really worth the extra cost?