I like the FXO, as it reminds me of my RL car, and in terms of racing, TBO is far and away my favorite class. In terms of sheer driving pleasure, you can't beat the LX4/6. So tossable, driftable, and fun to drive. The LX6 is as easy to drive now as the LX4 used to be, now the LX4 makes you feel invincible. I'd say the LX6 around FE Black is my favorite combo.