have you purchased any models yet?
if not, I highly recommend looking at the Necron Starter box. Why? Because it comes with a squad of Warriors, a Triarch Stalker (I *love* that model), and an Overlord. You can use it as the Formation, or just use the models.
Without using the formation, my only issue with this army is speed. Sure, necrons are pretty durable, but you have no way of moving forward. Using the Veil is great, but your initial list was better simply because you had a way of moving your Warriors forward to catch up to the Veil. In this option, if you jump your Overlord and Veil forward, they'd be unsupported by the rest of your infantry. This is why I suggest either a couple of the Arks, or (personal preference) Night Scythes.
I don't have point access available in front of me to give you a list suggestion, but I'd probably go with something like this:
Overlord w/ Phylactery, Warscythe & Veil
Lychguard w/ Sword + Shield x5
10 Warriors w/ Night Scythe
10 Warriors w/ Night Scythe
Triarch Stalker w/ Heavy Gauss
Triarch Stalker w/ Heavy Gauss
You can use the Doomsday if you like it, like I said, the Triarch Stalker is a favorite of mine; the Heavy Guass means it can break any enemy tank you have to deal with, and anything that you don't kill, other guns in your army can have an easier time shooting because of its other special rules.
You could also consider a Command Barge, which is another personal favorite of mine; if you give the Overlord a Phylactery, the entire Barge gets It Will Not die, and now you have a strong command unit (give him a Warscythe) that can throw himself into the enemy lines and make a mess.
