Best choice

I am mostly working with FCP X 10.3 and Da Vinci Resolve 12.5. So I need very good graphic power.
My Mac Pro 3.1 (16 MB, Radeon HD 5770, NVidia Q 4000) is no longer sufficient... and I can't even upgrade to Sierra OS X 10.3 now...
I have these offers now:
- Mac Pro 2016 (6.1) - 2.7GHz 12 Core - 64GB RAM - Dual 700's (around 7.000€)
- Mac Pro 2012 (5.1) - 3.46GHz 12 Core - 128GB RAM - NVIDIA TITAN 12GB (around 5.300€)
- Mac Pro (5.1) -12 core 3.46GHz / 96GB RAM / NVIDIA GTX 980Ti 6GB (around...

Best choice