In my opinion the Nissan 240sx Type X is the best drift car. I've tried all different kinds of cars for drifting and I still came back to this one. It's also my favorite car in the game. The FC is ok, but just not as good as the 240sx IMHO. I'm sure most of you will disagree but I found my drift style is far different from any of yours and my cars are tuned differently. I don't rely on tons of tuning, special tire combos, and tons of horsepower. I have relatively low hp (270-300hp), and mild tuning.
Low horsepower Supras and FD's are also ok drift cars. But drifting is all about technique. Just try all different kinds of cars and find what techniue you're best at, then judge which car is best for you.