I don't have enough details to know what would be a good price for your situation. Where I am, $170 is a fantastically cheap rate, but I don't know what that covers, where you're located, etc. I understand wanting a car and such, but like JohnGalt said, you'll just have to consider where your priorities are. Medical needs can and do bankrupt people in this country all the time.
Many people assume that if they are healthy then they only need health insurance to cover severe accidents, but how many "healthy" people suddenly have minor accidents or illnesses? A relative of mine was very healthy, then tripped and broke her foot and insurance had to cover the ambulance (she couldn't walk down the stairs to a car), the xrays, and the follow-up visits. A very healthy friend ate some cheese dip a couple weeks ago and got very ill - suddenly she needed insurance to cover doctor visits and testing for parasites. Another previously-healthy friend started getting weird symptoms one day, then found out he has multiple sclerosis. The medication alone is several thousand dollars a year, and that's in addition to doctor appointments, MRIs, etc. Maybe it's better to pay less for insurance and be ready to pay for these kinds of things out of your own pocket, but ask yourself: what would happen if you broke your foot and couldn't afford to go to the hospital? Would it still be worth it to have a car? Or maybe there's something else you can cut back on instead.
This forum is really great for helping people figure out their budgets. Try posting your income and expenses and people here someone may be able to help you find the money for those premiums.