There is some seriously conservatively advice in this thread.
I agree that a P85 right out of college is a pretty bad idea.
Make sure you like your job. I HATED my first job out of school. See how much you actually spend month to month.
Get a $20,000ish new car, tops. Drive it for 3-5 years (get a loan, put 50% down if you want, it will help your credit).
Pay off all your debt, including student loans.
Max out your 401(k) (for maximum matching). And put $5k a year into a Roth IRA. If you save 20% of your paycheck for your first 10 years of working you will be almost set for retirement (not a nice one, but enough to live off of).
Buy some decent furniture (not cheap crap). Buy yourself a few toys. I bought a camera ($1.5k), a bicycle ($5k), and some really nice pots and pans ($1k).
When you find a job you can tolerate, you have some credit history, look at your finances. Save your car payment for at least 3 months. Then take the plunge. And make sure you have at least 3 months cash on hand (you can count on getting rid of HBO, and canceling your Netfilx) to pay your necessary bills. Basically internet, power, heat, rent, FOOD, and car payment. If you buy a house you need another fund to replace a major appliance (I can pay cash for anything but a full AC/Furnace/Air Handler replacement) beyond your 3 months cash.
I was able to bank enough money to quit my first job and live fine for 6 months looking for another one. That kind of freedom to get out of a crappy job is priceless. It only took 3 months to find my current, and mostly awesome job.
I certainly don't have $100k (or ever $50k) to dump into a car. But I still have my buffer cash, and I tested the waters for another job before I bought my S. If I lost my job I could get a comparable paying job quick if I had too. It would be a crappy job but I wouldn't completely be up a creek.
You will spend WAY more money than you can imagine once it starts showing up in your paycheck. I have bought plenty of toys so I won't be wanting another TV as I already have plenty of big ones.