Have a leisurely look down through the threads in this forum, and you will find quite a bit of information. Also look over in the original Q&A on photo.net/photo; their search function will also yield quite a bit. My personal favorite at 3200 is Delta 3200; others prefer TMax. Sorry to not have a more definitive answer, but they can look pretty different. At 800, 1600, the field is more open. In somewhat flat light, I like the look of Tri-X pushed to 1600. When it is already somewhat contrasty, I get a better contrast range with Delta 3200. None of these films has a "real" speed faster than 1000 or so. They respond differently to pushing, and are good to experiment with to see the "look" you want. Also around are HP5+ and Fuji Neopan 1600. The Neopan didn't do it for me at 1600, ok at 800. John Hicks has some good information on developing times. Search for his stuff over here. Also, Look at unblkinkingeye.coom, where some of those times are posted for Delta 3200.(posted 8799 days ago)The world of low-light photography can get to be fun - it rewards careful experimentation.