Mugget, welcome to the forum!
Some good advice has already been given and I see, that you narrowed already your choices for starting up with an RF.
I would like to share some thoughts, that might not have been mentioned or might be useful for you.
I have been shooting Nikon DSLRs (and still keep a basic set with select lenses and bodies).
When I found a nice Nikon FM3a, to "try out film", I got complete hooked by BW film and not long after, stumbled by accident over a nice Leica M6 and one lens.
Since then, I have completely changed my preferences towards rangefinders.
I use now mainly a Leica M8.2 and as a second body with another focal length and high speed film for low light a Leica film body.
My preferred lenses are a fast 50mm on the M8.2 and a fast 35mm on the film body.
I shoot mostly, what is commonly call "street photography".
90% of this, I do during the late evening into the deep night, making fast lenses, slow shutter speeds and still the use of film necessary.
Against common preconceptions, I also use Leica RFs for motor sports and moving subjects - you do not have to be afraid of that, although, it needs more getting used to as doing so with a DSLR and long tele.
My longest lens is a 135mm f3.4, which served me very well, shooting at the 2010 Le Mans 24h. For the night, I also used a 90 f2 lens as this is my longest, fastest lens.
Some things, of what I do can be seen on my website or on my flickr site.
Motor sports with long lens:
M8.2 | 135mm wide open @ f3.4
…with short lens:
M8.2 | 35mm
Motor sports with a D3 and 300 f2.8:
…not much difference actually ;-)
Low light shots, where a RF really shines:
"racing with hot food" M8.2 | Noctilux @ ~f1 - f1.4
"married ?" M8.2 | Noctilux
… a shot, I would have felt very uncomfortable, doing with a D3 and 24-70mm, disrupting the rare and precious expression.
M8.2 | Noctilux
… a shot, easily done with any camera, but I feel more confident, doing it with a RF (any RF) - why? Because, the RF viewfinder helped me, to exclude the customers during composition, concentrating just on the chef of this busy grille and because exposure settings and focus are fully manually extremely quickly adjusted with the Leica, opposed to fighting a fully electronic camera.
You really don't have to be afraid of using a RF for certain things, most people do not use them for.
Where RFs shine though is clearly shooting between 28 − 90 mm focal lengths. Especially helpful are indeed the slower shutter speeds possible with a RF when handholding (I shoot exclusively handheld).
But!
RFs are not for everybody - you either completely love it or can't work with it.
I fell in love with it very quickly.
For the case, you might not like it, you should be prepared - only start with a more affordable film RF first or make sure, to try one before committing.
If you are a digital guy, a second hand M8 is unbeatable value.
Don't sweat the 1/8000th shutter speed of the M8 vs. the M8.2 - I never ran into issues, where the one stop shorter shutter would have helped me.
I certainly enjoy the small but nice other benefits form the M8.2.
Essential to me is the discreet shutter mode, where one can delay the shutter cocking motor by holding the shutter release after the taken shot.
This is essential for me and also fit's nicely into a film workflow, disconnecting winding from the exposure and making it a separate operation.
The overall lack of very long lenses with the Leica RF btw is often solved due to the fact, that mostly, you will just get closer.
Good luck!