I know this topic was posted before, but it's been a while and a lot has changed recently. I'm looking to hear primarily from active prop traders and those with first hand knowledge and experience; what are some of the best prop firms out there right now, and why? how has HFT and black box/grey box trading affected these firms' strategies and profitability? What are they now looking for in a new hire? and of course... chicago vs new york vs other: what's the best city for prop trading?