Sounds like you are asking about vertical biamping? So, you are looking for 4 mono blocks? Why not just get a Theta Dreadnaught and use 4 of it's channels or 250 watts each to vertical bi-amp? It would probably equal all of the mono blocks you listed for a lot less money.
If not, and you are talking about just "normal" bi-amping. I would take any of the bigger ARC mono blocks over the ones you have listed. But, there is a cost factor.
If not, and you are talking about just "normal" bi-amping. I would take any of the bigger ARC mono blocks over the ones you have listed. But, there is a cost factor.