I can testify that you do not need to have the greatest GPA or be from a Ivy league school to work for a legit prop firm.
I graduated in May of 2008 and was hired at a start-up private fund (prop model) in Stamford, CT as a jr. trader.
I had no financial risk whatsoever. No initial contribution, no software/quote fees, wasn't even responsible for commissions.
From June of 2008 to August of 2008, I played around on the simulator and learned general information about the stock market and intraday trading.
I finally went live in September 2008 when all hell broke loose. I broke even my first month, but lost money in October. In November, I only had four losing days and traded very well until middle of December. This is when I became overconfident, extended my stop-loss and got totally destroyed in January. Market changed from being choppy to trending in one direction.
I stayed until March when I resigned. I learned that the parent company shut down funding of our firm and it was rumored that our shop was closing in May so that's why I resigned. Two weeks after I did so, 90% of the traders were gone. Search Genesis and you should find my thread.
My P/L was overall negative, but not by much... It was a great learning experience although I ultimately failed. I have no regrets and it was a great learning experience. In hindsight, it seems that I learned what to do and not to do when I stepped away from trading for longer than a month.
Anyway, I've been hired by a second firm to continue my trading education. I will be relocating from NY to Atlanta, but I have confidence that with more training I can become profitable. I also have no financial risk whatsoever (aside rent and food). Hopefully my previous experience will remove my bad habits and hopefully the market will give me opportunities.
In terms of you wanting a trading career, pursue any firms you can. It doesn't matter if you don't have a Ivy education. Most people I talk to want the hungry, street kids as opposed to Ivy "geniuses". My former boss was against hiring overly smart candidates because they tend to be overconfident in their ability and struggle admitting that they ever could be wrong (refuse to take a losing trade). This is also consistent with many other firms.
The firms that want smart Ivy guys are the one's where their strategies have to do with market making in options or arbitrage. FirstNY is a good example. Other than that, their are other legit firms that hire regular college grads. You have to show that you are passionate and will do whatever it takes to improve your chances of being profitable. Traders are usually the alpha-male personalities so you need to tell them you would do whatever it takes to become successful.
Now from experience, being a new trader is not glamorous. Get used to eating Ramon noodles and being very poor for at least 6 - 12 months... Get used to renting out a room with a sketchy landlord or just a shitty place in general. You will be poorer than you were in school. Many guys have part time jobs on weekends and some even after work hours. Life is tough... trust me I did it for 9 months. But I will do it again soon when all the paperwork is complete with the Atlanta firm. Even if you make money as a new trader, it won't be much because whoever is in charge won't let you go too big. You have to be extremely dedicated to survive in this business. Even if you work your ass off, which I did, it could not work out.
Here are some resources:
http://www.tradersnarrative.com/list-of-proprietary-trading-firms-735.html
http://tracereed.com/
Good luck
PM if you have any questions.