Kinda hard to find... might stretch budget
Konica Hexar RF
For a fixed lens, Canonnet QL17 GIII but you will most likely need to change the rear film door seals yourself (not difficult but you need to find material)
Voigtlander Bessa R are also top notch. There are several versions that range from mechanical to electronic, with different viewfinders magnifications, and whether or not M mount or screwmount. So you will need to first decide which focal lengths most attract your attention.
Digital rangefinders will most likely be out of your budget. I use to shoot an Epson R-D1 heavily and it was awesome. Its essentially a Bessa R that Epson "Digitized". Very quirky, batteries are short lived and difficult to find, short rangefinder base length. But the 1:1 viewfinder is something to behold.
Contax G2 is also very good. I had one a long time ago. Its a dead mount, so the lenses are inexpensive. I would not recommend the G1 as it had some problems.
Also, you need to determine if what you mean by "rangefinder" is more related to the packaging or focusing mechanism. Two very different things. The X100 is packaged like a rangefinder but is not a rangefinder.. If packaging (size weight), then you have more options in the digital world. I would actually recommend the micro 43 system more in that case.