I plan to TR my wizard into a sorcerer and i have some questions

1) Going full Sorcerer or going sorcerer18/Fvs 2
Gaining some fire/force spellpower and critical % worth the loss of capstone ?
Also Fvs allow me to use wand of cure, for heroic leveling (I don't have warforged or bladeforged so it will be a fleshy sorcerer)

2) Feat
Some feats seems obvious : maximize, empower
Is Heighten useful ?
Is Past Life: Arcane Initiate useful
Should i go for SpellPenetration/Greater Spell Penetration/Epic Spell Penetration or Mental Toughness/Improve MentalToughness/Epic Mentaltoughness for more %crit ?

Any other useful feat for a sorcerer ?