Best bike for lower back problem

[Woosh]

That's not the same as my Suntour SP12 NCX which is a parallelogram type. The upright type similar to the one in the picture actually gave me a bad back along with a bad back for the friend I passed it onto.
I guess we are all different and need geometery to suit us as individuals.
Dave

You are right, Dave, sorry.
Here is the right picture:

 

[nashdm2]

Good replies guys and some other things to look at.

Regarding my medical problem. Its predominantly the upward shock into my lower spine that's the issue. Throughout the ride I can feel the pain in the nerves of my legs fire up as the ride goes on and the impact gets greater in the lower spine. Then for days afterwards, the legs are really sore. I currently am waiting for a specialist to MRI me then take a judgement. Its the same for fast walking for the same reasons, impact on the lower spine as the heels hit the floor. If I walk slowly to soften the blow, it's fine, which is why I am thinking that a full suspension system might help the same as slow walking does.
On top of this, I cannot lean over due to neck stiffness and shoulder issues etc etc lol.