2 for me. First video game I ever bought/played/loved. It's not as hard as the original and has less replay value than 3 but they made 27 quality levels and I know every one like the back of my hand.
CTR is good too but I was useless at the CTR token challenges so never got very far with it. Amazing tracks though, such a good Mario Kart replacement when I didn't own any Nintendo consoles.
