Aside from the x1 none of them are worth it and even the x1 can be gotten free at level 35 b spec. Just back up your save and buy the car for the trophy or if you really want the car, gift it to an alt account and then gift the car back to yourself. Free cars like that.
And if you hear as the warm night falls. The silver sound from a time so strange. Sing to me, sing to me.