Medium format digital

[Hans Klemmer <hansklemmer@xxxxxxx>]

Friends,
I'm looking to move from my 4x5 camera to a medium format digital  
system and am weighing the merits of Hasselblad vs. Mamiya and their  
new digital cameras vs. putting a Leaf back onto one of the older  
film style cameras (Hasselblad 501 or 503, or Mamiya RZ67). Has  
anyone in the group experience or opinions on either of these? I'm  
wondering about sensor size in respect to the internal image  
projection size, lenses made for digital imaging vs. those for film,  
costs of the cameras as well as parts availability (lenses and such).  
Predominantly, I'm an outdoor shooter currently working on a project  
of documenting dolmens and stone circles in Northern Ireland  
(currently on sabbatical from my college near Chicago).
I'd love to hear you all weigh in before I go out and make a wrong  
choice.


Thanks in advance,
Hans