Infinium should probably removed from your list.
Quote from EvOTraderV2:
You should be looking at the Chicago shops. As long as the account was in your name and is verifiable, you can probably find a few offers if you search. It won't be easy though. The industry is becoming really tough. I posted an article yesterday which brings up valid points about many prop firms beginning to sell trading products and services and many are looking for outside investors as revenues are in steep decline. The sad part is that many of the DF bill regulations won't even hit till 2014 so the storm is still on the horizon, so to speak.
Many of the big names like Archelon and Peak6 are converting to hedge funds to seek outside investors capital. There are some interesting quotes from executives at those firms. You may want to check it out here
Some of the names you can look at (if you haven't got around to that yet)
Arhcelon
Hard Right
Peak6
DRW
Getco
Infinium Capital
Jump trading
Optiver
Simplex investments
Spot Trading
Transact Futures
Wolverine Trading
Echotrade (they may only trade equities)
Cago Trading
Advantage Futures