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Z06 already has very nice lightweight rims and also very nice lightweight catback.
Personally i would go with an intake or headers.
repro chromes will be heavy as hell and probably not hold up to the elements. I have seen several chrome repros paint flake off.
But between the 2 choices I vote for a catback. IMO I think stock Z06 rims look great and the stock titanium exhaust already has 3" tips. Go for a 4" Quad tip exhaust.
The Ti systems are rare, lightweight and the C5 system flows well. If your car was any other color, voting would be more difficult for me. You need some bling.