Go for the Gold Scotty! You are very right, gold connectors do not corrode over time so even though the Tyros's outputs will if they do not have gold plating where necessary, your cables will still be top notch when you purchase your next Keyboard, and the next one, and the next one. Unless of course you accidentally destroy the actual cable somehow. Get my point? Don't penny pinch when it comes to your cables. Gold connectors usually come at a higher price but they are well worth it.

Best regards,
Mike