Orthogonal
Established
either a Made in USSR zorki 4/4K, Zorki 6, or a fed 5b. I know these have low quality but decent lenses, and are interchangeable lens cameras which is a bonus to me.
My experience with soviet era cameras is that their biggest problem is less to do with being poorly made and more to do with the organic lubricants they used back then seizing up/drying out. In my Feds/Zorki, soviet RF lenses and East German Werra cameras, the lubricant often turned into a brownish sticky waxlike gunk. Once given a really proper CLA they can perform very nicely but IMO they're rarely worth that time commitment, also take any ebay listed FSU camera that claims to have received a CLA with a very big grain of salt.
Like the others say the Canon P/7 are a pretty amazing and probably your best choices at that budget. I'm also big fan of 70's leaf shutter RF cameras in general (like the Canon QL17 or the Olympus RD/RC) but I feel they're pretty difficult to find in really good working condition and often have (or develop) issues with their shutters. When I bought my QL17 GIII I dug through more than 15 "working" copies to get a good one - most had slow/sticky shutters or problems at slower shutter speeds, again I think mostly because of aging lubricant.
For that reason I think the Canon LTM bodies would be the surest bet.