Yep, that looks like Delta 100. I started using it in 120 because I was bored w/ FP4 and needed a slower speed film for times when Tri-X just wasn't right for the situation. At least for me, I found that it had a hard time coping w/ the harsh sun here in New Mexico, but I haven't used it enough to decide if I'm going to stay w/ it. It sure makes nice portraits though.
I haven't seen any issues w/ JPEG's vs TIFFs. To my understanding, if the JPEG is saved as a large file in PS, it can be opened and modified a lot of times before seeing any degradation that would in any way affect your prints. Once you open a file you can make all of the changes you wish, it's only when you open and close the files to modify them over and over that you might see cumulative damage, but again, I have never seen any degradation in my own files, and some of them have been modified many times.