Long commentary from a bargain camera hunter:
I'm a die-hard Pentaxian, but if you're looking for the best value in 35mm SLRs, hands down (IMHO) it's the autofocus Minoltas from the 90s and later. 400si and Maxxum 5 are among my favorites. I own both, paid less than $20 and they are great cameras. Zoom lenses are dirt cheap; I haven't priced primes because I don't shoot AF much.
However, it sounds like you want manual-focus. That's my preference too!
The FG is my favorite Nikon -- I think you'll find it's loved by the people who own it and disliked primarily by people who haven't used it but "heard it's a lousy camera". I have found it both better to use and more durable than my FE (a camera that I personally think is over-rated and a bit over-priced, though not so much as the FMs). But one of the problems with Nikons is the lenses are expensive. Pre-AI lenses are cheaper but this means either using a Nikkormat (big, heavy and awkward to use) or the aforementioned FE (which means stop-down metering, which is a pain). As a lover of bargain cameras, it's not my first recommendation.
I'm all about Pentax -- I think the lenses are pretty reasonably priced (especially the 50/1.7) though some variants, like portrait lenses, get expensive. (I would pass on screw-mount though -- aside from the Spotmatic F, Spotties requires stop-down metering, plus the lenses are mildly radioactive... seriously).
Aside from the K1000 (price inflated by nostalgia) I think the Pentax Ks are decently priced -- particularly KM and KX. (The KX is my very favorite camera.) But like the Nikkormats they are big and heavy. MX is small but expensive and, like the FE, I've never really loved it. If you don't need manual control, the auto-only ME, MV, MG are good bargains. ME Super is my favorite walk-around body, but it's manual controls (buttons instead of a dial for shutter speed) are a bit awkward. I think of it as an auto camera with a manual mode rather than the other way around. Same for Super Program, though I don't own one of those.
You can get expert repair done on Pentax cameras from Eric Henrickson -- visit Pentaxs.com.
That brings me to my REAL recommendation: RICOH! Their XR- and KR-series cameras (made late 1970s-early 80s) are good manual-wind workhorses that sell for peanuts. They are compatible with Pentax lenses but Ricoh's Rikenon lenses (which are lighter) work well too. They feel a bit cheap and plasticky -- in fact RIcoh was an early adapter of polycarbonate, which is light and strong (20 years before Canon started using it for the EOS).
The XR-2 and XR-2s (s models can take a motor drive) are excellent full-featured camera with manual and automatic modes, match-needle meter with aperture readout (using a "Judas window"), shutter speed 4s- to 1/1000, DOF preview, multiple-exposure switch, built-in eyepiece blind for long exposures, mirror lock-up with the self-timer. Feature set compares favorably with the Nikon FE and I personally like the XR-2 better.
If you want a mechanical camera, that's the XR-1/XR-1s, which pretty much matches my Pentax KX feature-for-feature. (That said, a mechanical camera may need its shutter lubed and serviced and I don't know of anyone who specializes in Ricohs.)
I also like the KR-10, similar to XR-2 with fewer features. I don't like the KR-10 Super (or any Ricoh with the meter activated by a bar-shaped button on the front) -- the LCD meter readout is hard to use. Also don't care for the auto-wind KR-10M.
And if you want a REAL bargain, Sears rebadged these cameras -- XR-2s as Sears KS Auto, XR-1 as KS-1000, KR-10 as KSX. (Again, I say avoid the Supers.) Sears Auto lenses are rebadged Rikenons. Same cameras, even cheaper prices.
How cheap? Earlier this month, I bought a KS Auto with a Sears Auto 135/3.5 -- supposedly working -- for $15. (Don't know if it does work as the seller took forever to ship.) I've bought several Ricoh/Sears cameras and I don't think I've ever paid more than $40. Most came with lenses, and all but one of the electronic-shutter cameras have always worked perfectly. (I've had less luck with the mechanical XR-1 and KR-5, but nothing a CLA wouldn't fix; still, hard to justify an $85 CLA on a $20 camera!)
If you want some sample images, go to my Flickr page (
https://www.flickr.com/photos/aarongold/) and search for Ricoh and again for Sears. Lenses are a mix of Pentax and Ricoh and I usually note which I was using in the description.
IMHO there is no better manual-focus bargain!
Aaron