If you don't want to kill your wallet, a used RB67 Pro or Pro SD kit should set you back around USD500, with lens and a back, in good condition. A used Hasselblad 500CM is a bit more expensive, depending on whether you get it with a C lens or a newer CF lens. There are even cheaper options, like a Kiev 88 or a Zenza Bronica, both of which I'm told are pretty awesome for their price (around USD300+ with lens)
Go take a peek around Ron's Camera shop in Adelphi - I saw a nice Bronica there (might be ETSRi model).
Something you should keep in mind though - how deep the poison will run. Remember that these are systems - you buy body, backs, lenses, front lens caps, rear lens caps, body caps, straps etc, and if you're deep in enough, you're going to be letting go an entire kit to switch, not unlike a DSLR system
For example, my first MF was a 500CM from Chiii Fei of Chiif Cameras. It came with the light meter winder, an A12 back, an A16 back, lens caps, body caps, standard viewfinder, and the 120mm f4 Makro-Planar, all in excellent condition. Since then, I got myself the 80mm f2.8 CF, 180mm f4 CF, and 3 A12 backs, 3 A24 backs (oops), 3 sets of lens caps, and other goodies.
Now looking back, it might have been better for me to have just saved up and pick up the 203FE model. it's more expensive, but it's pretty much the best V-series Hassy out there (then again, I'm a bit of a purist), and the CFi lenses are purportedly even better than the CF ones that I have now. Still undecided, so the lesson here is that you need to think about how hardcore you are going to get. it's a slippery path ahead, full of happiness and tears
Also think about how strong your forearms are, cos the Hassy is lighter than the RB67. The RB67 is a BEAST of a body, built like a tank. Both the 500CM and the RB67s are workhorses, and I'm using them to hone my film shooting technique
