TX (400) and Acufine at 800 and a fast lens.

The only time I ever feel I need more than 800 is if I want to do the handheld pinhole thing, and then Delta 3200 at 1600 in D-76, but I haven't tested a lot of different options at 1600, so there's probably something better, but I do like the tonality and grain structure of D3lta 3200.