Do you need to be a nice and happy little pony?
That is, do you have to be Good alignment?
Otherwise, I think something like Mr. Ego would suit you. Since everyone else here have presented builds based upon Intelligence or Wisdom, here's one for Charisma:
Take:
20 levels of Sorcerer on one side.
On the other:
3 levels of Hexblade (Conplete Warrior).
2 levels of Paladin of Slaughter (Uneathed Arcana Paladin variant)
2 levels of Fighter to get the bonus feats to qualify for:
2 levels of Blackguard.
1 level in Battle Dancer (Dragon Compendium)
1 level in Warblade, for Iron Heart Surge and other assorted nice tricks. (Tome of Battle)
2 levels in Arcane Duellist (
http://www.wizards.com/default.asp?x=dnd/re/20030224a).
1 level in Chaos Monk (alternative monk from a dragon magazine I cannot recall at the moment, alignment Any Chaotic) combined with Ascetic Mage (Comp. Scoundrel).
Debatable trick whether or not this will stack with the Battle Dancer ability, but since they don't work the same way before the feat modifies the Monk, I would say it work. Regardless, might not sit well with your DM.
3 level in Ranger, for the skill points and the Track feat, the latter needed for:
3 levels in Eldeen Ranger (Eberron Campaign Setting).
The third level gives us Endurance, a prerequisite for Steadfast Determination. Something really nice, since that means you can apply your Con instead of your Wis to Will and not auto-fail on Fortitude Saves. Nice to have, given levels enough.
Necessary feats:
Fighter levels gives us:
Weapon proficiencies, Power Attack, Cleave.
Ranger levels gives us:
Track, Endurance.
Leaves us with 5 out of our 7 feats set:
Dodge.
Mobility.
Improved Sunder.
Ascetic Mage.
Steadfast Determination.
What does this do then?
Well...
CHA to saves 3 times (Divine Grace, Dark Blessing, Unearthly Grace), +1 more if it's a spell (Arcane Resistance).
CHA to unarmored AC x3.
Mettle.
Con to Will instead of Wis, no auto-fail on Fort Saves.
CL 20.
BAB 18.
If you get more feats that usual, if I understand correctly, the fighter levels could be something else. 1 level dip into a cloistered cleric with Pride and Luck gives some much needed re-rolls, as Maat_Mons stated earlier.
1 level in Rogue or Factotum at first level along with able learner (humans, changelings and doppelgangers only) would help with trapfinding aswell as skill points. 2 levels in Rogue nets you Evasion.
1 level of Marshall (MinHandbook) gives a minor aura to something nice, which is your CHA bonus to for example Initative.
You could skip 2 levels of Ranger as well, if you don't want Steadfast Endurance (or you think you can afford it's prereq. Endurance with a regular Feat).
I'm not sure this is the optimal way to go about this, but at least it's a start. It lacks good healing, which is a bummer...
oh and you are
VERY CHAOTIC EVIL