I encode my music using MP3 right now but I'd like to move to Vorbis. I use Lame with the setting --preset 160, which, as you probably all know, is 160 ABR. Now, I know that Vorbis and MP3 are different in the way they do things, but what quality setting in Vorbis would give me roughly the same quality as --preset 160 in Lame?

OggEncGT3b1 with -q 4,5 should be nice.