If I were you I would lay cat6 cable (better shielding and a bit more future proof), I imagine it's not too much extra effort to do it at the same time as the power lines and I wouldn't want to be transferring many/large files across wifi (if that's something you need to do).
I don't know about how far to run it from your power line but I've personally never had an issue with ethernet cables getting interference from mains power lines.
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