Rystil Arden said:
To add to kjenks' idea in a very dangerous fashion, get a mount that is intelligent enough that you don't need to spend a move action telling controlling it in battle (there are many ways to do this, of course--there are even purchase and training rules for some of the MM ones right in the MM, or you could do Paladin). Then gain some psionic PP somehow (psionic race, feat, etc). Then max out Concentration and take the Deep Impact feat and the Psionic Meditation feat. This will allow you to spend a move action every round to regain Psionic focus and still have your standard action to attack on the Spirited Charge, and you can spend the focus to make the attack a Touch Attack. Power Attack away!
Since this is for the Living Greyhawk campaign, there are campaign restritions against some of those ideas.
To "get a mount that is intelligent enough that you don't need to spend a move action telling controlling it in battle," all you need is to make it "war-trained" or "trained for combat riding while in battle" (per the Ride skill description).
SRD
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Fight with Warhorse: If you direct your war-trained mount to attack in battle, you can still make your own attack or attacks normally. This usage is a free action.
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Control Mount in Battle: As a move action, you can attempt to control a light horse, pony, heavy horse, or other mount not trained for combat riding while in battle. If you fail the Ride check, you can do nothing else in that round. You do not need to roll for warhorses or warponies.
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At most Living Greyhawk tables, giving an animal the six tricks in the Combat Riding package will suffice:
SRD
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Combat Riding (DC 20): An animal trained to bear a rider into combat knows the tricks attack, come, defend, down, guard, and heel. Training an animal for combat riding takes six weeks. You may also “upgrade” an animal trained for riding to one trained for combat riding by spending three weeks and making a successful DC 20 Handle Animal check. The new general purpose and tricks completely replace the animal’s previous purpose and any tricks it once knew. Warhorses and riding dogs are already trained to bear riders into combat, and they don’t require any additional training for this purpose.
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But since "war-trained" isn't well-defined, you'll see some table variations, where different judges have different opinions.