Havoks can be a pretty good anti hoard unit, 4 flamers, a combi flamer buy the 5 extra guys, and close combat weapons for everyone, mark of khorne and an icon of wrath you’ll burn a huge chunk out of a guard blob or mass of ork boys then you can re-roll the charge range and see what happens when you hit the survivors with 41 S5 attacks, or you can give them long range weapons and shoot across the table while the bigger troop units charge in and do the fighting.

Obliterators took a hit from not being allowed to shoot the same gun over and over, but not a huge one, and for 70 points a model it is maybe just about worth deep striking them in behind a squadron of vehicles and poping the twin linked plasmas on rapid fire or assault cannons(since they both have more chance to glance more AV10 things the death than the melta guns) or drop heavy flamers on Carapace armoured IG or eldar aspect warriors, at 210 points they really only need to kill one leman russ to pay for themselves.

The Defiler, has for some reason changed how it buys its upgrades so you can’t have the power scourge-which was a power fist in the last edition- and a havoc launcher like the one on your table there seems to have(thanks Phil…) and its gone up in points, but still its a battle cannon to lob a pieplate across the table, and the daemonforge, even if it goes wrong and take a hull point, you’ve still got 3 more.

The Forgefiend with three plasma cannon shots is decent but its not cheap enough to include automatically, and the once a game re-roll to wound has to be declared before you fire, so you could pop it off, roll a 1, lose a hull point then scatter off the target.

Maulerfiend, pretty good against other dreadnoughts , but it needs to avoid everything with krak or haywire grenades.

Land raider. yay… well I suppose you can put a dirge caster on it , put your 10 havocs with far too many flamers inside drive it up to the lines and stop the singed survivors overwatch shooting, but aside from that its a land raider, good, but just not great, would have been better to include the variant land raiders, or at least options to swap the guns out.

Vindicators come in 15 points more than the imperial version once you buy the siege shield and they don’t have a storm bolter, but still large blast stuff is rare in the chaos marine codex, so I’d consider it.

Predators again have a weird discrepancy to the imperial version 10 points more for the basic version, but the upgrades are cheaper so the all lascannon version comes in 25 points cheaper, so that’s your long range anti tank sorted then.