Don't expect to win every game!!!
Drop the Defiler Lascannon, and Plasma pistols on the Zerkers to give your Land RAiders DAemonic Possession (or at least
LC and 1
PP to give them extra armour)
When this reaches the enemy lines, you will reak havoc. But most armies will have enough fire power to stop or slow down your land raiders (especially without Daemonic possession).
Oh and Powerfists are probably a better idea than Power weapons, gives you two more tank/
MC killing weapons.....
P.S
Induvidual point costs for wargear isn't allowed, just list the squad cost and the wargear without their induvidual point cost