You have gotten many answers to this question, and most of them appear based primarily on what the folks who are responding use or have used.
There may not be one single best answer to your question, but since you specify the importance of keeping weight down I would eliminate a priori some of the suggestions, including Pentax 67 and Mamiya Press. These outfits are feasible, but will weight three or four times as much as some other options.
My main question for you would be how important is close focusing? If very important, I think the Mamiya 645, or Pentax 645, would be good choices. And I would simplify matters by using just one lens, a moderate wide angle to medium tele, say something in the 50-100mm range.
If close focusing is not important you will get the highest quality image for the lowest weight with a rangefinder outfit like the Mamiya 7II, or even a couple of 6X9 Fuji bodies. I would also include in my list the highly versatile Fuji GA645Zi, which is an auto-focus, auto-exposure camera with a 55-90mm Zoom.
I have some experience with all of the cameras mentioned so far. For travel photography my emphasis is on maximum image quality for minimum weight, and I am generally not interested in close focusing. With that, my choices would be.
A. For prints over 16X20" in sizse.
1. Mamiya 7II with a wide angle (43mm or 50mm) and normal focus (80mm) lens, or a 65mm and 150mm.
2. A couple of Fuji 690 bodies, a GW690III (with 90mm lens) and a GSW690II (with 65mm lens).
B. For prints 16X20" or less in size.
1. Fuji GA645Zi.
2. Mamiya 6 with 50mm and 80mm lenses.
I believe all of this would fit into you budget, with the possible exception of the Mamiya 7II. If concerned about the cameras holding up to hard use carry a couple of cameras. Fuji GA645Zi cameras, for example, can be had for about $800 in EX+ condition and would be a very light weight and versatile system.
Finally, when doing travel photography working with 220 film is a lot more convenient than 120 film as you got get twice the shots per roll which I find a great advantage. This is especially true with 6X7 and 6X9 formats.
Sandy King
ok i'm new to medium format and i'm planning on travelling around the world next and want better quality prints. So i'm looking for a camera that is well made and is unlikely to break down on me and can handle all the knock etc was from travelling. It will be for portrait and landscape photography, so was wondering what lenses you recommend, really looking at a max of 2 to help keep weight down, also really needs to be comfortable to handheld.
i'm currently looking into the mamiya 645 range, but wondering what other options are available
Thanks alot for any suggestions.