I will try the Tri-x. They sell it only in 5packs though.
For a big portrait project I would think this would be OK. I know you'll be happy with Tri-X... classic; there should be no doubts. But if you decide you want to try a for a fine grainless look also try FP4+.
If you are not going to print the film then you could do worse than consider using Ilford XP2. It is a ISO400 C41 film, black-and-white but with a clear base. You can get the benefit of the dye-image in your scanning, while still having the option of very smooth and flattering darkroom prints in the future in case you get the opportunity.
For a very 'filmy' look Delta3200 in 120 (at for example EI1600) looks great, but you might be better off making prints and then scanning those, in order to retain the 'atmosphere' if you really want the hybrid workflow.
Also, try some sample shots with and without a tripod. You may notice a difference, especially with that camera.
if you process your tmy in a different developer
you will find the grain.
i process it in coffee, and for years before that
i processed it in a print developer called ansco 130
beautiful grain ...
xxx is a great film too,
buy lots of it cause it is a real drag having to scavenge film and cobble together
another mother lode to finish a project after you start with one thing, and can't get it anymore...