The RCX is my preferred base computer for Lego Robots. Lego has a more recent mindstorm computer called the NXT, and though the NXT is probably more user friendly, I don't think it matches the versatility and compatibility of the 2.0 RCX.
Of course choosing your computer is mostly preference, however rcx motors are smaller and it's generally easier to build a chassis around these models compared to the nxt layout. The NXT does hold an advantage in that it's easier to program, however I don't feel like that pro makes the nxt the better computer.
