I think the red terror would be a lot of fun to play. No idea how viable that list is, but it would be hilarious. I would keep a score counter on how many models he has eaten that day!
Shrikes are really good too.
Last time I played kill team I brought my nids and I had a list of 3 shrikes and 10 hormaguants and the only team I couldn't beat was an ork horde! I was 5-1 for the day. I would defiantly bring some gaunts along with you with whatever list you run. 10 Termies is just 40 points so that should be easy to slip in!
As for the stealers, I've always wondered how a broodlord would do in a kill team mission. It is a big nasty beast to take on one on one. Throw a zoan or a venomthrope in there too for fun! Or a Lictor with shrouded and make it fluffy!
6 stealers, broodlord with scything talons, and a lictor is 200 points, I think. Lictor with shrouded, stealers with FNP and... something else and yeah... Have fun eating people's brains!