Ouch. Sorcadins hurt for casting, no matter how well-built they are. I admit, I like them, but you can't deny that being three spell levels behind the Wizard is a bad thing.
On that note, I am aware of the weaknesses and strengths of a Gish build. I know they are hard to play and even harder to make work right, so you've got 30PB to work with (a well picked spell list will more than make up for the weaknesses).
Hrm. My gut instinct is to go with something like this:
STR: 14
DEX: 14
CON: 14
INT: 8
WIS: 12
CHA: 15
With the human +2 to INT, this wouldn't be so bad: at level 4, I can drop a point into CHA to bring it to 16, and maybe pick up a charisma boosting item early on (with only 2700 gp, buying one from the start is right out
I'm fairly certain that this will almost certainly
not hold it's own with the other builds that are being submitted, and while I've seen divine casters being mentioned by other posters, no-one has actually submitted one.
In a three person game, inevitably one role is left uncovered: we've got an early bid for skillmonkey from the factotum quarter...which means that beat stick, divine caster and arcane caster are still unaccounted for. This was an attempt to bring something to the table that would fit those needs, but I'm not certain it isn't going to be a millstone around the collective party neck, and that just wastes everyone's time.
On Being behind the wizard:
My personal favorite in wizard is to go specialist transmuter or conjurer, and head for master specialist right out of the gate. And...you seem kind of down on wizards, no offense.
Being behind several levels isn't that bad, if you are planning primarily on buffing your own survivability (and that of your party) early on (E.G. Mage Armor, Shield, Enlarge Person).
Later, with arcane strike and wraithstrike, you can turn your spells into damage all you want, without having to worry about saves or SR.
At the end of the day, the build would end up with BAB 16 and caster level 18, as well as some decent saves and nice hit dice. <scratches head>.
I just don't know. Would you rather see something else?