I like the older Polaroids of the late 60's-early 70's vintage (such as the 210, 320 models). These have a folding bellows but take modern pack film such as 669 and 690. A wide variety of film is available for these from Polaroid as well as Fuji. The problem with these is that the batteries are no longer made ( a few NOS batteries are around but they are expensive). Not to tout my wares, but I convert these old cameras to use modern AAA batteries and resell them. You can e-mail me if interested.
Steve Perry