I guess you and I are kindred spirits. I'm loving using the Techno with bright GG. I'm yet to miss focus, at any aperture, under a range of light. Like you, I'm welded to 50iso. No grad filters, though!
And for the record, the DR of the Dalsa CCD is brilliant. I'm yet to run out of headroom or plug up the shadows.
I'm probably overusing my grads a bit, but I find them kind of fun to use. I like to shoot in stable light conditions when I can work.... very.... slooow...
I think the old-school tech cam ways are disappearing rapidly now though, soon anything but CMOS live view will be unthinkable to new users. And sure, when I get one where I can do movements without worrying about casts and crosstalk then I'll be very interested. Phase One's pricing has always been impossible for me though, but maybe Hassy will continue the CFV pricing strategy.
Although I for my current focal lengths really love the old 49x37 size, I think I can live with 44x33 by adding another wide. Just give me live view and a CMOS that doesn't suffer from crosstalk as much.
I'm not sure if the 645 full-frame will survive in the longer term, the returns of the larger size is really diminishing and production costs may not motivate it. If we have live view and electronic viewfinders the size of the viewfinder can be as large as we'd like regardless of sensor size. In the short term Phase One needs to get one though as their current camera system is designed for 645, and it will come I'm sure, it will be super-expensive, and it will almost totally kill off the CCD range for new sales unless they do a radical price cut.
That a full-frame CMOS probably will make their CCD range obsolete (except possibly for old-school tech cam users that still care about movements) I guess makes it not so easy to launch.