Also, for my current vintage prime setup...
Tokina 17mm f3.5 RMC - free.99
Vivitar 28mm f2.0 (Komine build) - 65$ from 1337
Pentax S-M-C (M) 50mm f1.7 - 25$ from some Belizian dude on C-list
Chinon 135mm f2.8/Nikkor AI-s 135mm f2.8 - 9$ from goodwill
I eventually want to add a faster 50mm, but I can't really come up with a great reason to ditch the Pentax, as I JUST got it last week, along with the Tokina and the Nikkor 135.
I also have access to the Rokinon 35mm t1.5 that I used to own, but sold to my buddy a month ago (didn't make a whole heap of sense, being that I have the 28mm to cover that focal length for way cheaper, and I never do iris ramping like I thought I would - plus that thing was stupid heavy and obnoxious to film with, and I like a lighter rig)
I usually just use these for video, but I take some photos with them from time to time.
I love that it gives me these effective focal length options on aps-c...
28mm f3.5
50mm f2
80mm f1.7
200mm f2.8
adding a 85-90mm lens would be nice to give me an effective 135ish option, in order to finish out the range, but I can't entirely justify it yet, as I rarely use that focal length, and the 135mm is fine as that length anyways, for portraits...