One thought to consider, to keep from having to truly horde up all the money a party of PCs will ever earn, is to setup a form of banking or storage, such that a player can hand you 1,000 GP and say he stores it in his treasure vault at the castle or some such.
Yup, we have "bankers drafts" in the form of EN Publishing's FANTASY MONEY.
How far are you going with the real props for gear thing? Rings, wands, rods and staff?
I used a card system for my own PC's gear. it worked alright, but in some ways was more cumbersome than the traditional char sheet.
We use Paizo's Item Cards. They work perfectly.
I forget if you linked where you ordered the plastic money and gems from, but it sounds like you found a pretty good cheap source.
Little place called eBay.
