I wouldn't call either your brown or grey choices "speckled". They look more like granite to me.

That being said, the "marbled" is probably more popular than the other two choices right now. Are these all laminate? I would say the brown is probably the best choice with your floors.

First get new lighting so that the colors are true when you are trying out samples I f you want to save a bit the new really good looking LED track lights install it yourself . Make sure the bulbs are daylight ones . I think with your floors I would stay away from gray for sure.