I thought I would update this with a conclusion, sort of as camera choice is very subjective.
Firstly what I didn't get and why.
Olympus OM4 - I have had an OM2n before, liked it but the shutter speed dial was always in the wrong place for me.
Canon - Only one person said about Canon SLR's so I didn't look into them even though the SSC 50mm f1.4 is one of my favourite lenses (On my old A7)
Leicas - Summicrons are over my budget
Minolta - Used to have an X700 with a 58mm and never really gelled with it.
Contax - A few bodies fitted the bill perfectly but I did want a f1.4 50mm lens and that put the price too high.
Pentax - The super ME is a bargain and maybe the best choice but there was a spanner in the works when I saw this photo.
Old Faithful by
Johan Niels Kuiper, on Flickr
This is what my ideal camera looks like, mint glass and great photos and well used body. So the Nikon hunt was on. FE2 looked like the one but good ones with 50mm 1.4 lenses were over budget so I started looking for an FE. I couldn't find, at the time of looking, a good condition one and also went out shooting for a day and used shutter speeds over 1/1000 a bit so started to get worried. Then I found the FA. To me it is basically a better FE2. Fully electronic which doesn't bother me at all and also has matrix metering and faster shutter speeds. Just a shame it has FA written on the front, I prefer the plain body look.
It didn't take long until one was ordered and delivered from Japan within 4 days. And here she is:
Nikon FA 50mm f1.4 by
Alex George, on Flickr
Also at the start of the thread Retinax suggested about having an SLR with a wider lens than the 50mm on my leica and once the Leica is back from service keeping both, so then this happened:
Nikon FA 28mm f2 by
Alex George, on Flickr
The 28mm has been converted so works fine except the matrix metering. It also looks awesome. The price of the Nikon lenses is very good, the 105mm f2.5 looks great and I may one day get one but is a bit long for me.
So there is my fun story. Camera has already had a roll through it, works great, focusing is fantastic, only thing I need to get used to is swapping lenses because they seat turning the opposite way I am used to. I've tested both lenses on my X-T3 and both render beautifully and are both nicely sharp. I've hardly taken the 28mm off my X-T3, seems like 42mm focal length is my sweet-spot.
Thanks for everyone's advice.
