Irish, the Contaflex Cameras are somewhat low-budget cameras, nothing really fancy sadly. It mostly depends on the lenses available and the condition, but you might check Camera31 in the Westbahnstraße. If someone, he will know.
Beaver, well, you obviously want to go full retard mode
But thats okay. Keep in mind the Leica is no toy camera, but i guess you know that. Recommendation, yeh well, that depends on two things. How good are you with guessing light conditions ? Can you go out, look at what you wanna take a picture off and say "well thats f/8 and 1/125" ? You dont have to spot on of course, that doesnt matter on film. You can be +/- 2 stops and get good pictures, but you should have a general idea of the light conditions, OR be willing to put in some time and learn to judge it. If you can do that, id say you go with the M2. If you want to go easy mode AND you got a bit more money on your hand, get a well used M6 for a cheapish price. That one has a light meter and you can mostly turn off your brain
A user M2 should cost around 400 Euros, an M6 around 800. Also keep in mind you can always use your Fuji to meter the light, or get a small pocket light meter to do the job. Both will help you learn to do it without
As for lenses, well, the Summicrons start at 1000 Euros upwards, thats for crazy people like me or rich ones (not like me), so i wouldn't recommend them for the start. You can get a very nice Summaron 35/2.8 as a wide angle lens or a 5cm/2 Summitar as a normal lens. Both are excellent and really nice lenses. The Summitar being a bit older, but still excellent. Loved mine, never figured out why i sold it actually. Also, you can get the 50/2.8 Elmar. Insanely sharp lens, not the fastest, but really good. Mostly comes together with the M2 since it was the "kit" lens for it. The 50/1.5 Summarit is a great lens too, thou already quite pricey and hard to get in good condition.
In the end id say the M2 + Elmar and Summaron would be the best bang for the buck you can get to start with. All together you should be around 1200 Euros, even less if you get a good deal or chose the Summitar over the Elmar.
And as a bonus, a picschur :
