[Crater101 (Warren)]

I have an old Pentax 67 (6x7) that I dust off occasionally. Out where I live, it's getting almost impossible to find someone who will process the film - but I do love the camera. It's big, it's heavy and it performs best on a tripod...but everything on it is MANUALLY set. Nothing gets done automatically.
This is why I love to dust if off occasionally. I have to think about what I'm doing, and I like that.
Sorry, I've strayed from the point... Medium format film isn't cheap, and depending on where you live, you may have a job to fins someone who will process it. The cameras themselves - Mamiya, Hassleblad, etc. - can be found in varying quality levels and prices on places like eBay. I'd be more inclined to make enquiries at a good camera store that deals in second hand equipment.
From the digital side of things, the medium format gear is very, very good - Fujifilm has become a very serious player in the market - but it can be expensive, and be prepared to commit to that system for lenses and accessories. Do your research first on what you want - image quality, portability, etc. - but bear in mind that a medium format system is going to be a bit bigger and heavier than an SLR based system.
Good luck, and let us know how you go.