There sure are a lot of opinions. I read Chris Johnson's book, The Practical Zone System, and then started thinking about switching from HP 5. That was a couple of years ago and what I settled on was Delta 400. I used/started with part of Chris' suggestions by exposing at E.I. 200 and developing in D-76, 1 to 1 for 9 minutes at 68 degrees. I was having trouble with my highlights - they were too dense - and so now I develop for 7 minutes which is working just great for me. I suggest you try your own experiments though. Good luck.