I think that you may have inadvertantly started a _very_ long thread. Read all of the responses, though. From my experience although APUGers are strongly opinionated, their opinions tend to backed with good, solid reason. A question like this really has no right or wrong answer. My response may be the least relevent.
Personally, although I am devoted to 35mm SLR's , I've never cared much for MF SLRs. If I bought a MF camera tomorrow it would be a used Mamiya TLR (C330/220). The perfect combo of quality, price and versatility. Obviously each camera has it's own strength's and weaknesses. You'll have to decide what features are important to your own style and ambitions and pick the camera that fits you.