Tilt-Shift MF???

I like my Linhof 6x9:
http://cameraquest.com/lint369.htm
As a lens with ample shift I use a Wollensak 90mm f/6.8 with a Rapax shutter:
http://www.flickr.com/photos/peterlerman/5133464723/
(It is not my lens - I searched this image on the www).
This is quite small for a 90mm, and I put it into a lensboard which is retracted about 7mm (other 90mm are too large for this board).
With this combination, which can be shifted quite a bit, I like to shoot architecture on a 6x7 rollfilm back - but of course it is an "oldtimer" setup.
Heinz

Linhof Technika series or the very similar Horseman 970/980 series have full movements, take Graflok roll film backs, and can also be used with their rangefinders as press cameras. There is also a 2x3 to 4x5 Horseman converter, though I should warn that the lenses built for the 970/980 don't allow much movement at 4x5. Lucking into a Horseman 980 with lenses and 4x5 back got me started in large format.

The Pentax 67 had a tilt-shift lens http://www.pentaxforums.com/lensreviews/SMC-Pentax-67-75mm-F4.5-Shift-Lens.html

Of course you have the cost of the camera plus the cost of the lens - if you can find it! Of course the weight of this bad boy camera will help you stay in shape! I think the various folk who've suggested a 2x3 Speed Graphic have the most viable suggestion, assuming that 2x3 cut film remains available, not a foregone conclusion. The rollfilm back would make more films available.

maybe this lenses for Pentacon Six ?
www pentaconsix com / shift htm

another vote for the Fuji GX 680 system

I'd urge you to look closely at the Fuji GX 680 system. I have a few bodies and also a few lenses. The largest negative size is 6 x 8 ! The front standard offers tilt and shift movements with all the lenses. Although with the widest lens - super wide 50mm the movements are more limited than with the other lenses. For the price of a Pentax 67 75mm shift lens (no tilt) you could have a 680 body, prism and waist level finder, 80mm lens, film back and maybe a 180mm lens. The lenses are wonderful, albeit a little slow - unless you invest in the 115mm f/3.2, 125mm f/3.2 or 180mm f/3.2 . They even have a 100-200mm zoom!

I have the Hartblei 45mm super rotator for my Pentax 645 outfit. The only reason this stays is for portability - as all the Fuji 680 lenses can be tilted and shifted on the 680 bodies (apart from the 680 IIIS body - mostly designed for the 100-200mm zoom and the heavier telephoto lenses to lessen torque from the weight of all that glass).

The Hartblei is very nicely made and feels solid, yet fluid in movements and focusing. A really nice piece of glass. And with an adapter it works with my Nikon F mount camera bodies.