we play big games in my small group, the normal 3000 pointer doesnt sate out gaming hunger, so 5000 has become the new 3k for us, that being said i sort of slid into necrons against my will, but already have alot of the models already, i figure i would give them a shelf space. so here is my working 5000 point list, looking for advice from necron players, it is certainly meant to be scalable down to 3k games when someone wants a quick game.

Tomb Complex 75
Nightbringer 300

infantry phalanx, lord, spyder 300
infantry phalanx, lord, spyder 300
infantry phalanx, lord, spyder 300
Armored Phalanx 300

six flayed ones, lord 225
six flayed ones, lord 225
six destroyers 375
six destroyers 375

one monolith, 2 obelisks 195
one monolith, 2 obelisks 195
one monolith, 2 obelisks 195

pylon 200
pylon 200
pylon 200

Abattoir 750

total:4710

should i go for another formation or use the remaining points for upgrades? im just under par for  war engines, so im happy there.,

the lord upgrade already comes w/ the inf phalanx
as far as the list, i'd probably go w/ more monoliths. 3 unit formations are too easy to break. granted monoliths are fearless but when they beam out at the end of the turn, your infantry is sitting there alone. one extra monolith to those formations allows the infantry to assault thru one and then go out the other on the 5 cm follow up. plus it beefs the formation up to 4 units.

i forgot to mention the pariahs. they are awesome and they have inspiring. you'll be spending most of your time assaulting so they are a good upgrade to take.

alright sounds good, ill squeeze another monolith formation and some pariahs in there

ok, i did some tweaking, how does this look?

Tomb Complex 75
Nightbringer 300

infantry phalanx,spyder,pariah 335
infantry phalanx,spyder,pariah 335
infantry phalanx,spyder,pariah 335
infantry phalanx,spyder,pariah 335
Armored Phalanx 300

six flayed ones, lord 225
six flayed ones, lord 225
six destroyers, lord 400

2 monolith, 2 obelisks 260
2 monolith, 2 obelisks 260
2 monolith, 2 obelisks 260

pylon 200
pylon 200
pylon 200

Abattoir 750

total:4995

can you explain the trick about assaulting out of one monolith and escaping through another? i dont quite follow.

assault- bring inf phalanx assaulting thru portal and leave them within 5cm of your second portal. win assault. 5 cm follow up move back thru second portal off board or thru a third portal.
of course this requires monoliths to be somewhat close to enemy but that should be no big deal. they can move up and put a blast marker on the formation your about to assault.
list looks good by the way. i usually play w/ more monoliths. but that should be fine w/ the flayes ones teleporting in. i'm sure someone else could point out some better options but i usually play a more "friendly" list. the necrons are in the process of toning it down a little.