I just had to go and read about the GF670!! Nice camera for compact medium format. A little pricey, but so are some Leica cameras as well as some of the other MF cameras in their own rights.
I have seen the Mamiya Universal and the Polaroid 600 SE on eBay and here and there (articles) If one were going to just shoot pack film, then the 180 might be the most logical for costs. For 120 and packfilm there are, of course, other option. I have a pretty nice Polaroid back for my Bronica SQ-Ai that you can set the film speed at what you want, and it couples to the camera with that information. It does take excellent photos, but small 6X6 size. Seemed a waste of the film when you look at how much area is not actually used.
I was just wondering if anyone had played with that Fuji Fotorama FP-1 Pro camera and adapted it to shoot film as well.