Many will consider this way excessive, but I use
-b 320 -k -q 0 -m S .

uh, don't forget -F
this Forces LAME to use 320 even when it is not absolutely necessary,
like during silent parts of a song.
This might only be necessary when using VBR like I do with :
-k -q0 -v --vbr-new -V0 -b192 -B320 -F -ms
but check the doc