Or what is the best one?
I've been using CDex, but I'm not sure which settings should I use for the best quality.
Anyone else use it? Whith what kind of settings?

For Quality, the options are Low (q=9), Normal (q=5), High (q=2) and Very High (q=0).
For VBR method, the options are Default, Old, New, MTRH and ABR.
For VBR Quality is from 0-9.
Anyone knows what these all mean? Which settings should I use for the best quality?
Check here to try it out:
http://cdexos.sourceforge.net/?q=download