I've just spent a week and a half in the NC mountains shooting in dark overcast conditions. Reciprocity correction was SOP. If I'm going to keep doing stuff like this, I need films that are built for it. I'm not talking about night photography here - but dark overcast in the woods seems to come close sometimes.

What 5x4 negative films (not transparency), color and B&W, have good reciprocity characteristics? Anything out there that can take a 10 second exposure as metered? For example, I read that 100Tmax has good reciprocity characteristics, but I hear that Acros is even better. Do any of you who use these films have experience that supports or contradicts the manufacturer's hype?

So, you low light fanatics - what do you use and how do you like it for those somewhat longer than usual exposures?