Behemoth could/should headline this (Next year would be perfect with their new record coming out + They are on Metal Blade so it's definitely possible.) Although I think Nile should also be on this, I don't think they could co-headline this. Top 4 spot? Absolutely, Just not co-headlining.
3/14 Dropkick Murphys
4/10 At the Gates/Converge