I suggest a "King of Pong"-type build.
Be Goliath or Half-Giant and take Knockback and Shock Trooper. If you are not averse to the War Mind PrC (it has its own minor manifesting progression, which you can ignore), then the following build might work for you. If you prefer Goliath, just take Wild Talent at first level.
Half Giant Lion Totem Barbarian 1/Dungeoncrasher Fighter 6+XXX/War Mind 5+XXX
Take Knockback, Power Attack, Shock Trooper, Leap Attack, Combat Reflexes, and so on. If you get Combat Expertise and Improved Trip, you get extra options, but they are unnecessary.
Charge 10 ft to your enemy, hit him and his neighbor with Sweeping Strike, and send them both flying into their allies with Knockback and Shock Trooper. This triggers trip attempts, and if you have Improved Trip, you get further Knockback attempts. Alternatively, bash them into objects for massive Dungeoncrasher damage. Have a buddy set up a tower shield for you to fling bad guys into. Get someone to fly you up and bash them straight into the ground. Go crazy.
If you are averse to War Mind, replace it with Factotum 3 for INT to bullrush and trip attempts.