My recommendation for the beginner's car of choice is the Mitsubishi Lancer Evolution X Final Edition, and well, as a matter of fact, any of the Mitsubishi Lancer models are fantastic beginner's cars. It's all thanks to their AYC technology, which makes pushing the cars very forgiving. You can stomp on the pedal out of many corners that pretty much any other car will spin out on, at least for the normal car anyway. You may not be able to get away with that with the Gr.B (including the Road Car variant), Gr.4 and Gr.3 cars, but those are still solid and stable rides as well.
It's best not to get too comfortable with it, especially if you'll be transitioning into some much more difficult cars to conquer, but if it's one of your very first times out on the tarmac in GT Sport, then it's a solid choice.
