Complete unrelated to my previous post...
Am I the only one who wants money to work more like it does in WoW? I prefer a game where, at low levels, PCs deal almost exclusively in copper. At mid levels they'd get their hands on silver as a matter of course. At high levels gold will be the preferred currency. I prefer a world where 1cp will buy you a days food and lodging, and keeping track of such amounts at level 1 might very well be important. But at mid level the PCs are more concerned with the food and lodging of their castles' inhabitants. And at the higher levels food and lodging are nearly an afterthought.
My preference is for 100cp = 1 sp, 100sp = 1gp, and 100gp = 1pg. A "pg" is a precious gem, which is a totally generic concept I like to use to rationalize a standard size and value of money that is greater than a GP. A "mithril piece" might also fit.