A big part of my game collection has been sacrificed to support my small but growing chip collection. Haven't played 18xx games yet but really enjoy Steam and the Railways of the World Series of games!
Have you tried Container? Very interesting economic simulation. It's been out of print for years but a new version is being produced and now available for preorder at Mercury Games website. Also, I'm watching with much interest a new game titled For-Ex - a currency speculation game that looks to have much potential.