drop the honour guard for an elite DH inquisitor, give him a Land Raider dedicated transport. Drop the Whirlwind and you now have like 200 points to play around with.
If you really want to go nuts drop the 6 Assault Marine squads to a Redeemer with no upgrades, take a Libby, and then 1 DH Inq with Land Raider (and 1 henchman) as well as 1 WH Inq with Land Raider + henchman.
Pretty sure that still fits, and voila, 8 land raiders! You'd even have 18 points left.
If you really want to go nuts drop the 6 Assault Marine squads to a Redeemer with no upgrades, take a Libby, and then 1 DH Inq with Land Raider (and 1 henchman) as well as 1 WH Inq with Land Raider + henchman.
Pretty sure that still fits, and voila, 8 land raiders! You'd even have 18 points left.