Ha, that rabbit hole yawned right in front of me almost immediately! I’ve ended up with a few, but I’ve sort of stuck on a couple - the Helios 44-6, and a Helios 28mm that turns out to be a Tomioka in disguise (and about 1/5th the price!), and a Nikkor 50mm 1.2, and Nikkor 300mm. The 300mm especially is phenomenal, easily the nicest manual focus I’ve ever encountered, it’s a joy to use and takes absolutely awesome pics. There are a couple still itching at the edges of the irrational-craving container, but I think I’ve managed to rein the gear acquisition in, in general, and am trying to focus on composition, and learning FOSS editing tools like Darkroom.