Don't bother encoding at 192. Use VBR with the following settings with Lame version 3.88 only:
-V1 -b 128 -mj -h --athtype 3 --lowpass 19.5
These are not my settings but the ones suggested by r3mix and just about every other decent site. I have tested these settings thouroughly and my mp3s sound great and the file sizes are about the same as encoding at 192 or maybe less. Figure on a little over a meg a minute with these settings.