I have to cast another strong vote for the Mamiya RB67 here. It might just be me personally, but no other camera has come close to allowing me to realise my vision - whatever it may be (and it usually involves awkward angles!) - like the RB does. That giant waist-level viewfinder, together with the excellent wide-angle (and fisheye) lenses, really does it for me.
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My 4x5in work is of higher technical quality, but in a 16x20in print, it's not really visible. And the RB is orders of magnitude easier / faster to use. Kinda feels like a point-and-shoot compared to a Linhof or Toyo view camera