Some things I've got to point out in some previous arguments, mainly L192whatever.
The Havoc Launcher does not fire 2 shots, it fires 1 twin-linked shot. The combi-melta is not 5 points, it's 10. I don't think that's worth it at all on a vehicle that will die incredibly quickly. The extra weapon destroyed is pointless. The chances of your opponent getting 3 Weapon Destroyed/Immobilised results before just wrecking you is highly unlikely. With the combi-melta, if they immobilise you, you just wasted 10 points.
Berzerkers are better than Noise Marines. Anyone that has played Chaos for even 2 months could tell you that. How can Berzerkers not take a charge? They can survive getting charged better than your average marine due to having way more attacks and extra WS. They even have a better chance than Noise Marines, despite the Initiative 5. They may be going first, but they're getting 1 Attack each and possibly 3 Power Weapon attacks from the champ as opposed to 3 attacks per Berzerker and 3 Fist attacks from the Champ striking at the same time (except for the champ).
OP, those Terminators will not work as much as you want them to. You're Deep Striking an incredibly expensive Close Combat unit. That is the worst idea ever. Run them in units of 3-4 all with Combi-meltas and nothing else. As you have them, they're easily avoidable and if you're unlucky enough not to be able to DS near any icons you may find your extremely expensive unit that WILL NOT make their points back completely dead. They're also too slow to make their points back ever.
Drop Abbadon. He is for Apocalypse only. Get a Daemon Prince instead.