Grad school financial aid eligibility?

[brittany .]

I'm about to graduate with my undergraduate degree, and thankfully my parents have paid all $150,000 of my tuition this far. Unfortunatley, that is it, and I will be responsible for any future educational costs. I'm 21 years old, and working part-time as I finish my degree. My plan is to begin full-time employment this summer with expected earnings of around $50,000/year. This is obviously no where near enough to cover tuition.

My question is, if my parents stop claiming me on their taxes, will I be eligible for financial aid on my own? My parents make too much money, so using them will squash any financial aid awards. Also, my credit is horrible. If I get loans, I will need my dad to cosign, and I'm afraid that will cause his finances to dictate what type of financial aid package is extended.