If the subs are Dual 4ohm voice coils, then you could do one ohm as well. I have a used amp that would give you a little more power at one ohm if you are interested.
I believe the jl audio 500.1 will do arolund 375 rms if I remember right, I'm looking to sell mine, but it might be a bit I need to get my "street cred" up a little.
I've got an MTX 4002 that is calling your name. perfect for what you want and underrated. it'll do around 500 and cleanly. I'll let it go cheap, shoot me a pm.