Well, I'm bringing the monolith because it's a pain to crack, and at 1000 points all of his heavy weapons will be focused on, well that.
I agree, I'm very short-ranged, however I won't be giving my Lord a VoD because teleporting him away will keep all of my other Necrons out of ResOrb range...and Marines can bring plenty of S8+ or powerweapons, I'd hate to not get a WBB. I put D-fields on the scarabs because my longest-ranged unit is a 24" rapidfire gun, I'm going to need *some* tank-popping ability.