Congratulations! graduation is a great time in your life, and its a perfect time to get a new car.
Personally, it hink you should go with the Toyota Camry. It's safe, reliable, stylish, and very good on gas.
My parents had one when i was growing up, and it lasted us 10 years, with no major problems whatsoever. Plus, you'll save a load of money on gas, you'd be suprised how smooth the ride is too!
The reason why i'd pick a camry over the corolla is becuase the corolla's interior seems a little cheesy to me, and the ride simply isn't as smooth, and as an adult in the new world, a bigger, more sophisticated sedan will give you a better reputation for your job then a smaller, more kid like car.
the second would be the Scion tC. It's simple, but classy, and it's easy to customize, but best of all, it comes packed with all these cool safety features. The only complaint i'd have with this car is the amount of cars that were lemon lawed due to sunroof, but other than the sunroof, the car is pretty nice