You really need rhinos for your troops!
Also, what is the overall plan, what will the termies do? Deep strike? Walk?
I'm guessing the sorcerer will be with them, he only has one short ranged spell, give him a mark at least. Combi-weapons are good on the termies, see if you can fit some in there(combi-melta being the top choice).
On your aspiring champ it's better to have a combi-weapon instead of the plasma pistol. it's cheaper and he doesn't have to give up anything. He will most likely only get one shot with it anyway. (if something is within 12" it will either assault you soon or you will assault it soon) A CSM squad is more often than not good off with having two special weapons instead of spec+heavy weapon, get them in a rhino, get them close and unleash the fury of the chaos gods! Hehe...
When the zerkers are in a rhino(which they need to be), bring them down to 8 guys. Not only is it fluffy, but they will fit around one hatch when disembarking, and most likely won't "overkill" an enemy squad, leaving them out in the open to be shot at the next turn...also, meltabombs are kinda bad. You get nice penetration, sure, but against vehicles your fist has more attacks and will hit the rear armour anyway(10) which is better, and against walkers you'll need a 6 to hit with it. Better to just melta it with ranged!
The predator is a bit too expensive. Since it has to fire all things on the same target the havoc launcher doesn't really go well with lascannons. The extra armour and dozer blade are also not that good actually. I've yet to see my pred immobilized by terrain or just getting stunned. For me it usually either survives or is viciously destroyed in cc or with melta at close range...
Also, welcome to the forum!
[Edit]: Also, looking forward to see pictures of those berzerker conversions, sounds like a cool concept!