Quote from mr.nononsense:
Refco Trading Services has prop trading in chicago. They are opening a 120 seat arcade in january. They have a great training program geared to both newbies and guys coming off the floors and want to trade upstairs. When you become proficient, you can trade in any of their other offices throughout the world. Also more offices in US are in the works. check out www.refco.com,and look for the discussion on Refco Trading Services.