4000 dpi for scanning on a canon FS4000US, but I confess to 1600 on my Epson 1640 for 6×9 Medium Format negs.
Paper? Well, most of all I print on my minilab (up to 12×18, R-type photographic paper through wet chemistry). But I have been fiddling with Ilford Gallerie Pearl paper this week – and the black and white quality is very good.