Feat Help

[Thailand_Dan]

Have a Lvl 15 WF sorc. Current Feats are:

Empower
Extend
Force of personality
Maximize
Mental toughness
Spell penetration

I would like to exchange a feat for Improved Mental Toughness, but am really attached to all. Leveling up, I used maximize and empower a lot, but now rely on Finger of Death more often. However, scorching ray and firewalls are still common spells. I like the 4-tiered aspect of having both feats (ie no enhancement, empowered, maximized, and both maximized & empowered).

Extend is my first choice, as I usually only use this for haste, and often accidentally leave it on, blowing SP for no reason. Fifteen minutes is usually long enough for buffs so extending them isn't that important.

Spell Penetration is a possible second choice, but like I said, I do use Finger of Death a lot. Which brings me to another question: Do all of these stack? Spell Penetration Feat, 3 levels of Spell Penetration Enhancement, and Spell Prenetration Staff.

Lastly, I was considering getting rid of Force of Personality. However, I'm not sure how this will screw things up.

Ideas?

[Twerpp]

Drop Force of Personality? You have WF immunities to many will-based spells and should already have a high base will save.