Vectorcam, bobcad, rhino3D, which one??

Hey guys!
I have been looking into some of the 3D CAD/CAM programs and would
like to know what you guys think. Mainly I am looking into buying
this year and am trying out some of the demos for now. Any hints, any
likes/ dislikes? Mainly the program would be used for fun and maybe
someday to make "real parts." I have a sherline mill (using CNCPro)
with a 4th axis but find 4D programs to be very expensive. What ya
guys think about vectorcam compared to rhino3D or bobcad? None of
them good? what would you buy? I would like to stay around the $500-
$1000 range (I know there is mastercam, surfcam, gibbs etc). If you
don't feel comfie telling "the truth" here please feel free to e-mail
me personally..I promise I won't tell :)
thanks!!
tauseef