For totally fine grain, Tech Pan is probably it, but overkill for what you're doing. Ilford Pan-F is a nice ISO 50 film, and is pretty-much grainless to me for 11x14 done off of a 645 negative (11x14 is where I start to be able to see grain in the shadow areas.(posted 9028 days ago)My favorite B&W film however is Ilford Delta 100. It's not as picky as TMAX about development, and just seems to shine.
I do all my own B&W development in PMK, but Delta 100 is forgiving enough that I wouldn't have a problem sending it out almost anywhere. I've had a local lab do a few rolls in the past, and they've come out stunningly well. T-grain emultions aren't the "best" for PMK, since they don't stain as much, but I always seem to go back to Delta 100 for look.
If you decide to do your own developing, Delta's about as forgiving a film as I've seen. I've never had a roll develop poorly, and I'm not the most meticulous person around.
Mostly though, I just shoot it because it has a look that I like.
Paul