There does seem to be limited options for each army as far as dealing with vehicles and monsters this time around.
I've been running two stalkers with Twin Heavy Gauss cannons. It's the scariest thing I can make for targeting vehicles and it gives a boost to anyone else who fires at the same target. Add a squad or two of heavy destroyers and you should be pretty dangerous to mechanical units.
The problem of course is that this eats a lot of points, so you need to scrimp elsewhere. Pretty much nothing else but warriors, an overlord and if points can be found a cryptek or two.
Nonsense is our Salvation