On sunday I go to face a small tournement on Sunday, which involves ambush scenarios, 400pts, HQ and troops only, no saves less than 4+ (5+ or 6+ are [U]NOT okay).

I have IW and plenty of 'em. I have the ability to field undivided. I'm thinkin a big, nasty leutenant with a few demonic add-ons and two tac squads with a vet skill or heavy weapons if I have the points. Please advise.