Wow, its great I'm psychic and know what type of skiing you do.
How about you tell us what you will be skiing most of the time. I personally mount my skis forward of centre, but thats preference.
If you ski mostly park, go true centre to -1cm
If you ski mostly pipe, or this is your pipe ski, go -1cm or -2cm
If you ski mostly all mtn, go -2cm to -4cm
If you dont care, go reccomended.
Sorry to sound like such a smart ass, but give us a little information to work with.