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I would actually recommend skipping Spirit Lion Totem on this one, because of the power level of the rest of your group. For the same reason, I'd recommend skipping Shock Trooper.
Pick up Power Attack, Leap Attack, and let that handle your charge-boosting. 1:3 returns on a two handed weapon will still be quite a strong oomph compared to the rest of your group, but not so much that it'd overpower them.
Use Wolf Totem Barbarian for Improved Trip, and then get Knockdown. You can charge, smack someone around a lot, and if they're still up, trip'em. Even in normal combat, you'll be likely to be tripping on most hits.
Build would look like :
Barbarian 1 : Power Attack, Extra Rage
Barbarian 2 : Wolf totem for Improved Trip
Warblade 1 : Knockdown
Warblade 2 :
Warblade 3 :
Warblade 4 : Leap Attack
Warblade 5 : Bonus feat as Fighter
You'll end up not as strong this way, certainly, but it'll be more in line with the rest of your party, while still being the biggest source of spike damage when you land a charge attack.
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The only reason to get Knockback is if you're using the Dungeoncrasher ACF at Fighter 2. That will let you deal extra damage equal to 4d6 plus twice your Str bonus against an opponent you knock-back into a solid obstacle, such as the ground if you're flying above them. It also gives you a +5 to Str checks to break obstacles, and +2 AC and saves vs traps. Pick up the feat Jotunbrud from Races of Faerun to count as large size when it would be beneficial, such as your Bull Rush checks from Knockback.
What race are you going with? You've got two feats at 1st level, but you can take one flaw, so with Human you can include Jotunbrud at 1st level.
If you have to choose between the Wolf Totem class variant and the Lion Spirit alternate class feature, don't go Barbarian 2 without Wolf Totem. I'd still put a second Fighter level in there on or after Knockback for Dungeoncrasher.