Quite a nice starting army,
One or two more Destroyers.
1-5 Blister packs of Immortals.
A box of 12 warriors and additional scarab bases.
3-5 Pariah blisters.
Beefing up what you've got isn't ever a bad thing for Necron armies.
If you are splashing out, a battleforce would give you all the warriors and Destroyer's you'll need, and possibly save you $ in the longer run.
Agree with all this really. make the immortals a squad of 10, run another warrior squad. Maybe not bother with the 1 pariah - you could always convert him to be a Lord on foot.
Try the army out as it is, and see if you feel you need more combat, more shooting, more bodies on the field. See how the army feels to you. Then you could look for some wraiths possibly or flayed ones. Depends how you want to paly your army. But i think you will want to fill your immortal squad up and run another squad of warriors at least.
