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I like the first idea, kill stroke and gradient. I don't mind it being on the left side of the yin-yang but you needs to make it less intense if you are going to use it, it draws to much attention.
Also curious to see the ball in different positions in relation to text. Main reason is that the ball not being on the same baseline as the text looks a little funny to me because it's ever so slightly off. Maybe make it align with the base line or really push the position or size so it looks more on purpose then just a little off.
i like how the other designs have the text and vector art more integrated, I would like to see that quality more in the first design.
