I am optimizing (not for uber-highend, just for funny huge effects on casting at lvl 8+) a wizard.
The Prestige Class I am basing my character on will be Metaphysical Spellshaper (Book of Erotic Fantasy).
So at first, it's gonna be a human (dunno a better class and the feat is nice) wizard (specialist evoker, didn't found anything useful to trade scribe scroll because I need the lvl5-feat). First five levels:
1 Specialist Evoker 1 Scribe Scroll, Bind Vestige, Envelope the Wall (+X adjustment)
2 Specialist Evoker 2 -
3 Specialist Evoker 3 Repeat Spell (+3 adjustment)
4 Specialist Evoker 4 -
5 Specialist Evoker 5 Maximize Spell (+3 adjustment)
This should be clear, Bind Vestige is for later Metaphysical Metamagic (ability damage for metamagic), Envelope the Wall and Maximize Spell is to qualify for Miser with Magic.
Repeat Spell and is very strong, so I take it with the free lvl3-feat.
6 Metaphysical Spellshaper 1 Metaphysical Metamagic, one free feat (could be Metamagic School Focus, Arcane Thesis or something else)
7 Metaphysical Spellshaper 2 Miser with Magic (+0 adjustment)
8 Metaphysical Spellshaper 3 Metamagic Reduction 1
now I start getting crappy:
9 Magical Trickster 1 Bonus Trick, Spontan Trick, Twin Spell (+4)
10 Magical Trickster 2 Irresistible Spell (+4 adjustment)
11 Magical Trickster 3 Bonus Trick, Meta 1/day for free, Tricky Magic
I actually loose a spell progression level at lvl9 (but i qualify easy for magical trickster) but I gain Bonus Skill Tricks, more uses for them and (much more important) a free Metamagic Feat. And the ability to use one Metamagic Feat per day for free (max. +4 adjustment).
Now the caster is kinda getting cool, he may take any spell (i.e. Cone of Cold), prepared with Miser with Magic and cast it. While casting, he adds Twin (+3), Repeat (+2), Maximize (+2) and the 1/day free Irresistible Spell to his Cone of Cold, taking 7 damage to any ability (f.e. Charisma). He deals now 11*6*2=144 damage, no save (or with errata it would be a DC +10 to half). Due to Binding, he heals one Charisma damage and on his next turn, another Twinned Maximized Irresistible Cone of Cold resolves. Also, due to Miser with Magic, he may do a Spellcraft Check (he got +2 synergie +14 ranks for a total w/o items of at least +19) with DC = 10+2*Spell Level = DC 20. So he REGAINS his prepared Cone of Cold, able to cast it again.
Only problems: I need high caster level for evocations and I could need some more Metamagic Reduction, Ability Healing and Metamagic Feats. Would be nice if anyone can help me with that.