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What about factory 18" sport classics IIs that are made by BBS? Mine are silver but I think in gold with the barrel machined aluminum or silver would look good on your car.
I was messing around on the new Mustang configuration site and I tried to approximate an Aventurine Green color with gold wheels and gold side stripe. The idea was mainly just to get a feel for how the colors work together.
For your car I wouldn't touch the wheels. I'd focus on subtleties such as vibrant reddish orange brake calipers (not gold, let's get our color wheel straight here), orange F and R turn signals and that's it!
I have another non-993 vehicle that is dark green and considered a few different colors of aftermarket wheels, ended up going with Bronze. Not as flashy as Gold yet popped a little more with the green than the Anthracite.