OP is not living with them and alledges that yearly income is approximately the cost of the car or less... that said, he really can't afford it right now -- period.
If the OP is hell bent to get this car, my recommendation is wait until the 2011's come out, and track down a low mileage, gently used 2009 model, which will be significantly cheaper.
Based on the 350Z, the 370Z should depreciate in value by as much as 10% of the original wholesale price each year...