They seem to be around the same price.
the 461s will run you a few hundred more then the 391s
391 can usually be found used for around 400 while the 460 bodies alone are around 400
so depending on hpw much you really want to spend that might play into it
i have never owned 46xs so i can't comment but i did own 391/3 and loved them till i got my 481/3