Just a few thoughts...
I can't say anything about Minolta, because I haven't used one.
My first SLR (back in 1969) was a Pentax Spotmatic, and they're great cameras (and the old Takumar lenses were often excellent). But I don't think I'd recommend one now, because they're a bit long in the tooth and many are now unreliable (the shutter eventually jammed in mine, and it wasn't economical to repair). They also used an old mercury battery that is no longer available.
Pentax K mount cameras are definitely worth buying and using now - I mainly use Olympus OM SLRs, but I also have an MX with a 40mm pancake permanently attached. The MX uses LEDs in the viewfinder though - I prefer a match needle myself. (I think the K1000 has a match needle? But the K1000, with its reputation as an ideal student camera, can be a bit expensive sometimes).
My personal favourite SLRs are my Olympus OM1 and OM2, but there's little to choose between the OM1 and the Pentax MX. The OM1 does have a match needle, but it also uses a mercury battery (I had mine modified to use SR44/LR44 batteries - the OM2 uses SR44/LR44 as standard).
I've used very few Pentax K mount lenses, so I can't really offer much. I love the 40 pancake, for its angle of view and its small size. I've briefly used a 50/1.7 and I found it to be very sharp. The older 28/3.5 is a cracker - possibly one of their best ever lenses (I had an earlier screw-thread Takumar 28/3.5 with my Spotmatic, and I think it is optically the same lens - it was a big favourite). The 28/2.8 is well regarded, but I think the 3.5 has the edge. In fact, if I saw a 28/3.5 going at a reasonable price I'd be tempted - just to carry round in my pocket when I'm out with the MX/40.
I know far more about Olympus Zuiko lenses - I have a good selection and have used more. And I think they're amongst the best in the business.