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@gbj_tester
Chain is the wrong place to look for weight savings. Wippermann 1R8 (1/8") or 7R8 (3/32") weigh a ton next to inferior chains, but for good reason, and still less than 100g over the lightest cutaway/hollow pin chain. It's hardly a weightweenie build if you're using the FSA Gimondi anyway.
If you still insist on making bad decisions, get a 3/32" sprocket if the one you have isn't already and use a 9s road chain like KMC X9SL, under £25 to members at http://www.merlincycles.co.uk/Bike+Shop/Road+Parts/Transmission/Chains/KMC+X9+SL+9+Speed+Chain+-+Silver_1161.htm