johnscott10 wrote:In regards to the list I would largely be tempted just to use large squads of warriors, they can deal with most armour(apart from flyers) decently with their gauss weapons. The only issue is if they get caught in combat, it will really mess them up so a few Wraiths would really help.

Its a bit of a shame that you have a tournament coming up as I personally would have said "Get anything you like the look of."

Smolo82 wrote: Using Obyron and the Despair Cryptek you can go in and out of the game and can make a new squad for the 2+ wounds.

I would like to say that this "trick" actually doesn't work, if i recall correctly.

From the Deathmarks it says "When a Deathmark unit deploys..."
The Ghost Mantle and Veil of Darkness only allows the unit to Deep Strike in that turn. It doesn't say anything about going back into reserves. Its just a very different infantry move.

Feel free to try to prove that Deathmarks can indeed redeploy via the Veil of Darkness or Ghost Mantle to get their 2+ to wound.

I also remember speaking with a GW store manager who dismissed this "trick".

GCMandrake wrote:In brief, here's a rating of all the units in the Necron codex, rated as bad, ok, or good. Just my view on things from my experience, I'm sure everyone will have different opinions. And only a very general look at what units you should be going for.

Special Characters: Bad or OK.
Overlord: OK.
Overlord with Warscythe on a Catacomb Command Barge: Good. Always take this as your HQ unless you have a very good reason not to.
Destroyer Lord: Bad

Royal Court Necron Lords: Bad
Royal Court Crypteks: Good. Specifically Eldritch Lance, Solar Pulse (always take one, preferably two of these. One of the best pieces of wargear in the game) and Voltaic Staffs are the three best bits of equipment.

Necron Wariors: Ok. Should always have a transport and preferably crypteks for extra shooty.
Necron Immortals: Ok. Always take gauss weapons for the glancing hits.

Ghost Ark: Good. A unit of warriors with 2 Eldritch Lance crypteks makes for a very dangerous roaming gunboat.
Night Scythe: Good. Being able to take flyers in troop slots is HUGE. Makes Necrons the strongest airforce in the game.

Deathmarks: Ok.
Lychguard: Bad.
Triarch Praetorians: Bad
C'Tan Shard: Used to be OK if you took Writhing Worldscape and lots of Crypteks with Tremorstaves. Now, with Dangerous Terrain nerfed to allow armour saves, they're just bad. Sadly.
Flayed One Pack: Bad
Triarch Stalker: OK

Canoptek Wraiths: OK, but overcosted.
Canoptek Scarabs: Good
Tomb Blades: OK. If you have spare FA slots, take units of one with Particle Beamer, Shadow Loom and Nebuloscope. Stay in cover and fire accurate, high strength blasts each turn for just 45 points. Otherwise, large units with gauss blasters.
Destroyers: Bad
Heavy Destroyers: OK

Doomsday Ark: Bad. Far too expensive, and a single weapon destroyed result cripples it.
Annihilation Barge: Good. Best choice in the slot.
Monolith: Bad. Sad, as it's the iconic necron vehicle.
Doom Scythe: Good. Was just OK, but flyer changes in 6th made them very dangerous.
Canoptek Spyder: OK. Scarab farms can be nasty.

You don't mention if the tournament is a) 6th edition, b) allows allies or c) is two FOCs. I can't help you with lists unless we know those points.