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Ive been playing a few games lately and my opponents regulary field lots of Monstrous Creatures
Take my last game as a example. I played against chaos, he fielded something like

2 Princes with slaanesh/lash
1 greater Daemon
5 lightningclaw termies
1 Plasma Dread
10 marines with aspring and plasma
10 marines with rhino and plasma
1 Raider with the termies
1 Pred with 3lascannons

With the new BA's im not sure how to handle something like this.
Normaly the MC's cause me the most greif. And if i extend my efforts to kill these
the heavy's will probably cream me. (just for your info, i hate the cheesy list)

Any lists or suggestions?

Devastators, with four heavy weapons, broken down into Combat Squads. Give them Missile Launchers, Multi-Meltas, or Lascannons. Concentrate fire on each Monstrous Creature - the Combat Squads should help you allocate fire without over-kill.

Baal preds (or even regular pred destructors) are excellent for burning down daemon princes. They're only T5, and will succumb to a ton of mid-strength heavy weapon wounds fairly quickly. Since non-lascannon preds are cheap in BA & DA, they're quite a nice choice.

That Chaos list isn't even cheesy. In fact, it's pretty awful. I'd bet that you simply don't have enough AT (because AT is also usually anti-MC) weapons in your list. Why not post your list? It will probably be easier to comment then.

Edit: By the way, I--surprise surprise--agree with Nurglitch. BA can't do cheap las/plas, which sucks, but you can do efficient Devs, so make use of that if you aren't going for Baal spam. I certainly wouldn't use MMs, though. The points saved are sadly not worth the round(s) of shooting you will lose due to their poor range.