You can't go wrong with
RazorLame using --alt-preset standard or --alt-preset extreme.
From LAME's command line help:
For VBR modes (generally highest quality):
"--alt-preset standard" This preset should generally be transparent to most people on most music and is already quite high in quality.
"--alt-preset extreme" If you have extremely good hearing and similar equipment, this preset will generally provide slightly higher quality than the "standard" mode.
JohnE.