Ray Butler , Jul 16, 2013; 11:02 p.m.
Sounds like she looked up the specifications and design of a Mamiya 645 Pro (or 645 Pro TL or the slightly older 645 Super), and then composed the list of requirements to match it! I'm kidding of course, but it does fit the bill perfectly.
Also the Bronica ETRS or ETRSi would match these specs.
The main difference between them being that the Mamiyas key you into a huge range of lenses, often with faster apertures, and also adapted lenses from several other medium format cameras; while the Bronicas only work with their own more modest range of leaf-shutter lenses.
The Contax 645 and Hasselblad H1/H2 "fail" on price, and a non-detachable grip.
The Pentax 645 series and the older Mamiya M645/M645J/M645 1000s "fail" on non-interchangeable backs, only inserts.