You'd want to talk to maverick74 about that. I don't think you'll find any web-reference, but there is a couple of threads on it here. vtradergroup.com is one. I believe Cornerstone shut-down last year. Access to retail PM/risk-based haircuts have probably not helped to grow the niche.
G2 and First New York are the ones I know about. Also, in Chicago there are multiple places_in the style of Bluefin, which is more oriented toward market making.
Yeah, Cornerstone is no more. Are you looking to be a market maker or to join a JBO type arrangement? Anyway, here are some lists: http://www.traderslog.com/proprietarytradingfirms/ http://leverageacademy.com/blog/proprietary-trading-shops/ http://www.tradersnarrative.com/list-of-proprietary-trading-firms-735.html
Filthy is a nice guy and works at Bluefin. If you want to shop your CV... they don't really care what your style is as long as you have an edge.
Also, try Cutler group. We are a San Francisco based Market Making/Prop group with offices in San Francisco, Chicago, Philadelphia, and New York. I would be interested in looking at your resume. PM me.
You can check out these guys. http://mavericktrading.com I don't know anything about them. Someone brought them to my attention awhile ago. I left a message on their machine to get more info and they never called back. So that's that. Good luck.