Honestly, Necrons are bigger problem then Terminators in Kill Team, you can field 11 of them, and with their statline, WBB and not much power weapons or AP 2, it's pretty hard to kill 5 of them before they manage to roll some 6's on to hit.
We play a lot of Kill Team over here, and best things are the one with multiple choices (Chosen CSM, Broadside with Firewarriors as backup), or strong hitting ones (Pathfinders in cover with Striking Scorpions watching for anyone moving close). Only thing Termies have going for them is Invulnerable save, because AP 2 is going to hit them sometimes, and that can is not so hot when you have 4+ cover most of the time.
Also, my Kill Team list:Spoiler
8 Chosen Chaos Marines
2 Power Weapon
2 Flamer
1 Plasma Gun