I think my best handling car is my FQ400 Mitsubishi Evo VIII GSR '04. Paint the car darkish grey, oil change, stage 3 high rpm turbo and CH tires. Boom. One hell of a beast on Zahara track.
I think the Toyota TS030 Hybrid '12 is a absolute beast. Very good handling, acceleration (0-100 around 3secs) and topspeed (around 340km/h). Can be used for 550pp races aswell.