Poker Chips!

I finally bit the bullet and bought some poker chips. They're smaller than the normal, but seem to be quite solid in feel, so I think they'll work pretty well. I bought two sets of them, actually. Counts are: 20, 40, 80x3 (black, green, red/blue/grey respectively).

ironphoenix, do you know if there is a suggested chip-count for something like 1830? Or the other 18xx games? Or does one just have to figure it out from the bank total and chip availability?