I'm sure there is considerable interest in the Silver coins. Until I get a better count from the others in our NEW buying group, I'd guess we would be interested in around a dozen of the Silver coins.
As for trackability, if I were to get a silver geocoin in my possession, I certainly wouldn't let it loose in the hopes that it would travel from cache to cache and person to person. IMHO, it just wouldn't happen. Sooo, making it trackable on GC.COM would just be a waste of money. However, I WOULD have them numbered anyway so that each one is unique. If trackability is really desired there are other, cheaper ways of doing it.
Since, I wrote the software to track the UTAG Geocoins, I dare say that with a little encouragement and incentive, I could change it so that it would also track your Wyoming coins, too. Right now, it is written specifically for the UTAG coins but it wouldn't be too hard to allow both. It's just a thought in case you're interested in that option.
--SirGerald