Merg -
Any preference regarding SLR vs rangefinder? Want the flexibility of interchangeable lenses, or the simplicity of a fixed-lens camera? Need autofocus?
For a solid, capable SLR system, I'd look at something from Nikon, which offers probably the largest selection of bodies and lenses available on the used market today. If I was traveling with one body and a few lenses, I'd take an FM2 body with the 28/2.8 AIS, 50/1.4 and 105/2.5 lenses. I also like the Nikon F3 - a bit heavier than the FM2, but built to take a beating. Olympus OM, Minolta MC/MD and Pentax K mount bodies and lenses can also be very good, but Nikon alone can accommodate it's F-mount lenses with newer AF film and digital bodies (with some exceptions), if you ever need to do so.
For rangefinders, I'm partial to Leica bodies, but the cost factor goes up a bit. Not as convenient to use as an SLR if you like lenses longer than 90mm, and Leitz wide-angle lenses can be pricey, although Voigtlander makes some very nice wide lenses at reasonable prices. I use an older M2 with hand-held or shoe-mount meter and it's very quiet and nice to shoot with.
BTW - Wonderful portfolio on your web site! I'm guessing you do your own printing, and am very impressed by your work. I'm striving to reach that level of skill myself someday....