Did I hose up my feats?

[LordKalkin]

I have been wondering about my feats, and if i screwed up. I try and see what people recommend, etc.

So anyways, I hit 15 yesterday and picked my last 2 feats (Drow Wizard).

L1 Mental Toughness
L1 Toughness
L3 Heighten
L5 Spell Focus: Enchantment
L6 Extend
L9 Improved Mental Toughness
L10 Enlarge
L12 Empower
L15 Maximize
L15 Spell Penetration

So I don't have Greater Spell Penetration. This worries me regarding monsters with greater resistance/saves.

Also, my current Enhancement setup.

Drow Spell Resistance I (filler)
Elven Spot I (filler)
Improved Empower I
Improved Enlarge I
Improved Heighten I
Racial Toughness II
Spell Critical Chance Fire/Cold III
Spell Critical Multiplier Fire/Cold II
Spell Damage Amplification Fire/Cold IV
Energy of the Scholar IV
Wizard Int III

In combat I wield Superior Potency VI and Spell Penetration VII scepters/staves

I should probably remove Enlarge, I hardly ever use it.
I am also thinking ditch the critical enhancements and just go for damage multipliers
I obviously need spell penetration enhancements.

Is there any point into dumping into Drow Spell Resistance/ Elven Enchantment Resistance? Will
those stack with magical spell resistances?