Baal Predator should wipe floor with them, but do not fill your army with flamers only. And remember that BP is expensive. If you prefer CC, always try to get assaulting bonus yourself and that's why DC is good here. Sure, they're expensive but 10-man squad is only 200 whitout jump packs (useless, 'nids will run at you anyway). Weak 'nids will die in simple bolterfire so Death Company might be used with bolters (and maybe hand flamer?). Then you can assault (Relentless) and if you have 100 points to spare, chaplain is always good with these guys.
And against tougher guys, a Drearnought is always nice.
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