Thinking about necron killteams / killzone squads is no longer a straight forward task thanks to the shiny new codex that is packed full of cool ideas and upgrades. I've been toying with a couple of ideas and themes, but here's one that I like, based on models that I have (or might be likely to purchase) rather than uber-competitiveness.
2 canoptek scarab bases (30 points)
2 deathmarks (38 points)
1 lychguard (40 points)
total = 199.
The main weakness is a reliance on gauss weaponry to inflict damage on armoured targets or troop transports. I just hope that they're going to be uncommon! The scarabs are there for the beast rule and entropic strike, whilst the death marks deal with any target that looks likely to do significant damage (terminators and the like). The lychguard is the all-rounder in this team and also the fire magnet, running during the shooting phase and wanting to get in to combat quickly.