Okay - I'll give you three options. None of them involves a computer of any description - and you can't get much simpler than that. Mr. Gates, Mr. Jobs, and Mr. 'Adobe', please take note!
1. Contax G2 - better lenses than
most of the Leica ones. And they only cost about thruppence-ha'penny, rather than £2000 a pop. (Well, you wanted a punch-up, didn't you?

)
2. Nikon F2 (or FM3A/FM2n, if you prefer something a little more compact).
3. Mamiya 6, if you want more square inches of frame. (or 7, if you can't get a 6, or want a few more lens options, and possibly more ultimate optical quality).
- All of the above coupled with the technological simplicity of a wet darkroom, to avoid that glorified Babbage's Difference Engine nonsense.
There you go - stick that in your SBLOO and smoke it!