I'll advise you to do what I did 😀 get a Canon 7. It's by far the single most common model of any of them, Canon or Nikon, and as a result they tend to be cheaper. Get one that spent most of it's life in a neverready case or in the dark and you can get a good meter as well. The advantages in lenses are as Vince mentions above me. The finder is wonderful. Personally, I like it the best of all the ones I have used up to this point in time. There are parallax compensating bright lines for 35, 50, 85/100, & 135 that are labeled in the finder. It's bright, clear and very easy to use.
The biggest negative, and it can be significant, is that they did not put an accessory shoe into the top deck of the 7 instead providing a somewhat rare and expensive addon shoe. Kevincamera has one, IIRC, for $150. The Canon 7s, a slightly newer version that was made in far smaller numbers, has a shoe and a mercury 625 battery powered CdS meter. Unless you plan to use wider than 28/35mm lenses (largest finder line & outside edge of finder) then those advantages aren't worth the extra cost in my eyes; YMWillV.
I got my Canon 7 for $190 from KEH in Bargain cosmetic condition and perfect mechanically & added to it a $100 Canon 50/1.8 from a fellow RFFer for about as low priced an entry to the golden age rangefinders as you can find. With a little patience, you could do likewise leaving a nice pile of money for a second lens or lots of film.
Good luck in your decision,
William