Graflex "graphic" cameras has limited movement. You should look into getting a Linhof Technika or MPP Micro Technical if you want one thats portable. If not, almost any monorail will do. The latter one can be had quite cheap, both here or on the big olde auction site. Brands that are widely appreciated are Toyo, Cambo, Wista, Sinar and Calumet. Linhof, Graflex and MPP also makes these cameras. I know all of these are 4x5's, but 120 backs can easily be acquired.
If you're insisting on using smaller ones, read this article:
Theres a Cambo SC-1 up on the bay right now, for an okay price. Takes RB67 backs.