get some monster hit dice (you can advance pixie a few hit dice according to the srd). Your hit dice are outsider hit dice from half-fiend, so they are really quite good.
Do you think it's better to advance outsider hd rather than 4 sorcerer die plus eating LA for goodies?
I was planning on doing:
Pixie fey HD//Sorcerer
Pixie LA//Sorcerer
Pixie LA//Sorcerer
Pixie LA//Sorcerer
Pixie LA//Sorcerer
Half Fiend//Fiend Blooded(heroes of horror)
Half Fiend//Fiend Bloded
Half Fiend//Fiend Blooded
Half Fiend//Fiend Blooded
If my DM doesn't let me through the to fiend blooded due to humanoid requirements, I will take the sand shaper route instead, maybe keeping half fiend, or possibly trying to get the radiant template instead, since it would give me a net boost of +6 CHA:
I was planning on doing:
Pixie fey HD//Sorcerer
Pixie LA//Sorcerer
Pixie LA//Sorcerer
Pixie LA//Sorcerer
Pixie LA//Sorcerer
?//Sand Shaper
?//Sand Shaper
?//Sand Shaper
?//Sand Shaper
Feats I'm looking at are: SpellFocus(conj) + augment summoning (though there are a lot of beatsticks in the party), touchstone (a must for Sand shaper), searing spell, extend spell, persistent spell, After that idk