Ben, I use Neopan 1600 a lot. Rating it at an EI of 1000 and then developing it by averaging the times Fuji gives for the film rated at 1600 and 800.(posted 8544 days ago)Plenty fine grain for 8x10. I usually do mine up to at least 11x14.
chris
Although you didn't ask, I would recommend using a 50mm or even wide angle lens for that kind of work.