So far, my shen is the best car I have. It drives straight, and turns very well. My Z-car is also nice, but I was a little disappointed in it. I thought they were supposed to be super super high quality. Oh well! It was the most expenive car of the bunch. I am eagerly awaiting the arrival of my LXX special Castrol edition Skyline.
EDIT: I am going to pick up a Microsizer from a local hobby shop, I hear good things about them!