Kat even with your parents helping you out you are still a first time buyer. There might be something that a Lender could do, but honestly I haven't come across that, and if you were refering to the seller more likely than not you being a first time buyer won't make them lower the price.
$600K can buy you something good out here in Brooklyn. I'm not sure how familiar you are with the Area, I lived in brooklyn for the past 16 years and we have some great spots. Park Slope is rated in the top 10 neighborhoods in America, it's trendy, tonds of restaurants, bars, stores and a park. There is also Fort Greene which is a very hot area right now and very close to all the major train lines, Williamsburg would be another area, Boerum Hill, and have you ever considered Long Island City? Many people don't know about it, but when they see it they just fall in love. Great Views of the city, its 7 minutes by train to midtown and it's up and coming area which also makes it a great investment.
Kat give me a call or shoot me an email, we can go over what your real wants and needs are for your apartment and anything else which you may have questions about.
Looking forward to speaking to you