General

Skill Book selling opinions

Hello, (2nd thread. I think the Merchanting part is removed from the front page...Couldn't find my thread afterwards)

I go Hilla often with a friend often because...Well, just because.
Anyways, the current skill books that I know of are:
Advanced Charge - Paladin
Advanced Combo Attack - Hero
Angel Ray - Bishop
Dark Fog - Evan
Flame Wheel - Evan
Magic Mastery - Evan
Soul Stone - Evan
Final Cut - Blade Master
Phantom Blow - Blade Master
Final Blow - Aran
Combo Tempest - Aran
High Defense - Aran

USUALLY, if I get a book luckily, I sell them anywhere from 80-130 mil, ignoring the norm NX Ratio of 1:50 on Basil. I do it because I remembered when I used to have less than 10 mil in mesos, and desparately needed the advanced charge. Eventually, the event with the Gaga stars let me sold enough pots to buy it on free market for 180mil. I was really sad, because I never accumulated and used so much ever...but loved the great improvement in damage because of it.

ANYWAYS, it has come to my attention that some books are probably wanted far more than others.
I was told that Dual Blade books (Blade Master) can sell easily for 150 mil, going as high as 200 mil, where as not a lot of people go for the Bishop books. I know I'll keep the Advanced Charge (Paladins) to 100-120 range always (because it's special), but I wanted to know what your opinions are.
Are any of the books more prized than the others? I don't want to always spend NX on scissors, so I'd like to sell the stuf that matters.