Sir,
Autofocus devices are not made for manual focussing even if they have a mirror and a matte screen, so if you go for a Canon, make certain that you get the special screen for focussing. And if using an EOS for focussing manually, one may easily adapt the excellent manual Nikon, Leitz and Zeiss lenses while utilizing Canons lightmetering . Canons own lenses are useless if you decide to switch bodies.
The original Leitz R8 (late series) and R9 usually still work, even if Leitz has given up on long time servicing their own products. Contax is also an orphan, but a used one will cost less than a professional overhaul and their viewfinder is reasonably large, bright and accurate. Today I have had to choose between putting a film in my Leitz R8 or my Contax ST, the ST won beause of the versatile, contrasty and sharp 35-135 zeiss, even though it is bulky .
p.