Mr Bob
I am lost. Are the Marines with the Chaos or with the Nids? This is a Chaos thread yet you have not mentioned Chaos ?
If it is Chaos and Marines, and you want to kick ass, depending what the nids have, do with Air assaults and aircraft. Bomb the enemy for two turns, and when they are full of BM or hard-up troops, hit them with combined assaults. Victory should be quite easy from there.
Mind you, this is a really nasty way (and probably not fun for the opponent) to win against nids who struggle at air defence.
Otherwise, you could make it a challenge, and take daemon summoning Chaos Marines and have them supported by your ATSKNF Tacticals, add in some tanks from either side, and you should have a real slugfest.
