For chaos you have a few options for anti-armour, obviously you have the heavy support options to explore. Oblits work well with the lash with the Plasmacannons, whilst preds are versatile, although my guess is you won't wanna go that route

. You could go with CC defilers which work well with lash too. Drag unit forwards and fleet a defiler in to rip it a new one. Also once they reach defilers are good at killing tanks, unless its skimmers. Plus you have havocs which have the best firepower but least manauverability. Raptors and chosen are two other options,
2 melta's that are moving in rapidly, with the threat of a powerfist if need be are pretty good, plus have the advantage of serving multiple roles[raptors kill troops well too]. Raptors are really cheap for what you get, and big units get very cheap benefits from the various chaos marks. Adding an icon also works well with other elements of your army namely termies and oblits.
Chosen give you a few anti-tank options, infiltrating for side armour, plus being able to have heavyweapons in small squads, and also the close range special weapons fire from plasma and meltagun death. Again they can solve several roles.
There were 2 main Netlists that i saw immediately when the codex came out[actually before] that being the oblit/termie spam and also the raptor swarm[not seen someone put the army together yet]. However i think theres a big oppertunity for the mixed but synergetic list to do well as well.
Termies and combi-weapon give you a great "one-shot" powerpunch, great vs elite armours and often vechiles if you can get into position.
Using raptors with an icon, to ds in oblits/termies where you want them could be a very powerful tactic if you get it down well.
I think the real "dillema" that faces chaos players is what to do with your troops choices. Go with cheap units that will do very little? 10man squads of csm to get Heavy weapons are expensive heavyweapons and you can't even split like combat squads. Or expensive but powerful "god" troops?
I've waffled on a bit there, but if i were to look at your list as is i would say a] sorcero needs MoS, and i would change for second prince as its a scoring unit. Get more oblits over termies as overall there better imo as they serve the role you need in the list and 1 oblit is easy to take out.
I think if i made a list from scratch around lash i would go with 2 preds and 3 oblits as my hvy support, with raptors to ds oblits and termies too. I helped my mate come up with his gt lash list, but he decided[after some pressure from myself] to go with a fluffy slanesh list.