I use Silo these days. Before that, Wings. Before that, Rhino 3d. Before that Max 2.5 (very briefly).  I am supposed to be learning XSI (I'm the XSI forum mod also) but I haven't the time and that forum's pretty dead anyway, so no huge rush.

Important point to all that hoopla: It's not the tool, it's what you do with it.  :)