Hey guys,
First off I know little bout necrons, except having a copy of the codex and seeing some batreps.
Finally got my orks into a playable size and got my first few games last week (reasonable success considering I lost them all

) I have noticed and am aware of my/orks ranged anti-tank abilities and am planning on using necrons to assist my army (great conversion opportunities over tau). So my initial thoughts are/were:
To go with my speed freak force:Overlord in command barrage2x 10 necron warriors in ghost arkscryptek with solar pulse - possibly put into one of the GA's?
Roughly 700 points worth (so perhaps a little too much? Only wanted to compliment a 1000/1500 point ork force). My thoughts here being that I can use the solar pulse to assist my advancement into mid-range, then the
GA's and warriors can be used along with the overload sweeping to deal with tanks etc.. While the
GA's also add to the amount of vehicles in my list, hopefully giving the opponent to much to shoot at before my trukks and Battlewagons unload there crazy angry mobs
For my less mobile forces(foot slogging/biker lists: Overlord - command barrage possibly?2x 5 warrior squads2x crypteks with eldrice lances and one solar pulse - both going into one of the warrior squads
this is the cheaper option around 400 points, provides me with 2 squads that I can use to hold objectives with the lances assisting with anti-tank, the overlord feels a little outa place though?
I thought about perhaps adding a little more to the second choice, such as a Doomsday ark? Thinking that I can magnetise/convert the ghost ark so that I can swap it between a doomsday ark and a transport and/or converting the command barrage to also act as an annialation barrage too when needed? I have a few other ideas I am toying with but if any more experienced players could comment i'd be very grateful

Still a noob in the tactical department.