Live it up! Today could be your day or years down the road--your death.
Hell, why only a M3 or 370? These cars are peanuts. How bout a 997 turbo? You're a recent college grad, you must make lots of money at your first job?
Who cares about this precarious economy? I bet your expertise in whatever job you acquired is so rare that nearly no one can replace you; you're like a brain-surgeon, your services are in high demand and your pay is commensurate to your talent.
Additionally, why not move into a posh place that costs $3,000+ month? You deserve it buddy!