I like Carrara, myself. But then, that's all I've really used :P
Being a mac (*gasp!*) user, I never really had the option of 3DS. That and we had Carrara for the longest time, so I got used to that.
And sometime, I'm going to learn LW... But that one is also really expensive. Carrara, on the other hand, cheap. Relatively.
I actually got a slightly stripped down version of Cinema 4D (CE 6) with this one magazine. But I'm pretty sure I'm not allowed to distribute it. :P
About the only thing I can say I like about C4D is the volumetric light stuff. That's fun, though not really relevant to modeling...
But do try out the free stuff before springing for a commercial program. You might surprise your self. And if all else fails, you've at least gotten your feet wet in modeling...