The best is Neutrik (Gold pins or Silver), and they used by the majority of manufacturer of cables, like Synergistic Research and still others. Moreover they are not the most expensive. :)
Orcas 747 I have used Bocchino audio http://www.bocchtech.com/bocchinoaudio/baxlr.htm - although expensive they are superbly built and you can try different cable toplogies forever with complete ease and use a wide variety of cables and ribbons - I have not really compared them as it is too much trouble - I have achieved good results against very expensive cables but have not swapped XLR's
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