I've decided to use a silver standard in the mini6 game I'm working on. It makes more sense to me than the buckets of gold approach found in D&D. It was a pretty easy conversion, as I just took the D&D equipment list and converted it to silver pieces. It's still not very accurate historically, but I think it makes a bit more sense.
There's a pretty cool thread about all of this over at RPG Site. I recommend giving it a lookover if you are interested in this kind of thing.
And regarding my mini6 fantasy game, it's coming along. I still need to come up with a bunch of magic items, but much of the work is now done, other than tweaking stuff.