This calls for Kale the Auramaster (I really need to update my page for the build some day, so I can actually link it without embarresment)
Saint (+2 LA), Marshal 2 / Bard 1 / Divine Mind 10 / Paladin 3 / Dragon Shaman 1 / Dread Commando 1
Items: Horn of Goodness, Admiral's Bicorn, Regalia of the Hero
I've played this guy in a lvl8 game, and he was terrifyingly effective. His horse could outfight Ogres, and every party member was so far more effective that the DM had to start throwing utterly ridiculous encounters at us. I voluntarily retired him, but he remains by far the most powerful character I've played. And he couldn't even do much by himself!
Concept: Buffs are decent, sometimes. But unless your buff increases the buffee's power by a sizeable fraction, it's not worth the combat round. Also, making only one party member uber leaves others feeling left out... assuming that the buff has an impressive impact, and if it doesn't then what's the point? The Auramaster bypasses both these problems by relying on a host of minor, passive buffs that affect many people and don't require an action to activate. A +2 bonus to saves is generally not worth a combat turn even at low levels, but a constant, permanent +2 saves is actually a pretty sweet thing to have. And +2 saves for everyone in the party might be a lifesaver. Combine a variety of defensive and utility auras (Motivate Dex is good here) with Inspire Courage cheese, and the Auramaster becomes rather gamebreaking. His boosts, while individually small, are numerous and are multiplied for each member of the party. Only use this guy with experienced DMs though, as balancing for a party with an Auramaster is a difficult task indeed.