Get a 240sx or an AE86. Best starter drift cars and used frequently in competition. 300 would be kinda cool, except for the fact its heavy, hard to tune, its has a more advanced ATTESSA system to disable (4 wheel steering + drifting = picture above), and its horribly expensive to really tune a 300. But im not saying if i get in a 300zx at work, i dont try and drift it. You can't really drift well in a FWD car. Your not so much drifting as doing e-brake slides...A good drift can be held and linked through multiple turns. BUT I'm not saying dont do it, its still hillarious in a fwd car, i do it in my hatchbatch as a turning technique, just be ready for square rear tires.
Rob