Well, I haven't seen GC's PClass, so I can't comment there.
However, I think GC is right about the Sorcerer's "fort'e". In addition, there is a Feat that already covers this (Extra Spell). I'd forgotten about it because I don't use Vancian casting.
Perhaps after Epic comes out, this idea can be revisited, possibly with Extra Spell as a prereq, along with an exceptionally high Spell Craft and DC. Personally, if I went this route, I'd also keep the Spell Focus concept (again, though, that's personally).
On top, this is N Hammer's Feat, so arguing with FR about it is kinda silly.
Another thing, FR, about this:
...it is not as munchy as the wizard because its main stat is not as useful as intelligence.
Do consider that the Wizard is far more dependant on their Skills (research, learning new spells, etc.) where the Sorcerer has no such dependance.