You can't find better DR in a technical sense. You might find slightly better midtones, but differences will be tiny.
What you can get is more resolving power, movements and a lot sharper wide angle lenses. Tech cam is the way to go. View cameras like the Linhof Techno are a bit more expensive in terms of body, but cheaper lens mount, so with many lenses it can be more economical.
I think the Credo 40 might be a bit too close in terms of resolution and actually slightly worse DR to really impress. A second hand P65+ maybe? Same DR, larger sensor more resolution.
I use a Linhof Techno and a 33 megapixel Aptus 75 back with Schneider Digitar lenses, most components second hand. Quite affordable, but the back is a bit aging. Still competitive though, and thanks to lenses I generally get better single shot quality out of this system than I would from a D800/A7r. To me using the Techno is about enjoyment in the photographic process, and I really like having movements when making landscape pictures. I think you should think about that - how you want to make images. If it's all a race about image quality, it's going to get costly, and there's always something better around the corner.
Hi
I agree with Torger - a full frame sensor is much better for the wide, which if you decide to go tech - is where it really shines, (apart from the process) and with a 60 meg back, you can use the (comparatively speaking) the less expensive Schneider Lenses.
It you go tech, then there are light weight bodies.
Arca Swiss - Arca-Swiss Rm3d factum - an advantage of AS is that should decide later you want a view camera, you can use the AS mounts on a F line.
Alpa - ALPA 12 STC - Small and light.
Cambo - WRC - 400 - very nice - I have one
All of the above give you rear movements (rise and fall - or shift) one at time - You rotate the camera for one or the other - this is nice for panos or changing the horizon.
For swing and tilt - I believe the AS you have swing and tilt built in Alpa you can add an adapter for Cambo you have to get swing and tilt in the lens mount.
The Linhof - has an a advantage as Torger says as you can put most any LF lens on just by mounting on a inexpensive lens board.
If you do not want movements now or later and going wide is not a pressing concern - then from what I have read, the new (or second hand) Pentax is good value for the money.
-- you will have fun!!
best
Phil