Other sites that already got their feet wet with alts: https://bitcointalk.org/index.php?topic=273148.0
It would be logical to ask http://www.amagimetals.com/ (precious metals, after all), but need to think about how to approach a merchant that doesn't currently accept Bitcoin or any alts (takes significant work to research and integrate).
I think amagimetals will put themselves in a pretty touchy spot if they take on a virtual currenty that 'sounds' like a physical commodity, thats just asking for trouble = "I ddin't know", "I thought it was", "ooops, sorry" etc ...
sure it sounds like there shouldn't be a problem but you'll see