Feats list after the update

[Gnorbert]

So I'm planning on TRing my wizzy into a sorceror. I've been planning this since before savant was announced, so now I need to adjust what I want to do, obviously.

Where I'm getting caught up is on feats to take.

Will be warforged pure Sorc, so 7 feats to work with.

Stats for context:
Str: 10
Dex: 8
Con: 18
Int: 10
Wis: 10
Cha 16

current proposed feat list (in no particular order):
Toughness
Maximize
Empower
Heighten
Spell Pen
Greater Spell pen
Extend?

Is the Wizzy past life feat worth fitting in there?

You recall more about your past life as a wizard. You have +1 to the DC's of spells you cast and can cast the magic missile spell ten times per rest, creating a missile of magical energy that darts forth and unerringly strikes its target inflicting 1d4+1 force damage. For every 2 caster levels beyond first you gain an additional missile, maximum 10 missiles.

Should I drop greater spell pen in favor of the past life feat since I'm already getting an extra +2 spell pen from the passive past life feat? Or should I maybe take extend early and then drop it later in favor of the others?

I'm leaning towards dropping the greater spell pen to fit it in but I'd like to hear other opinions on feats.

EDIT: just noticed the Spell Focus feat requirement for Savant II ... so now I need to fit that in too.

Cheers