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If you want real speed - confirm whether your processing software can either use multiple cores or Direct Compute.
If the answer to multiple cores is yes - well the 10 core I7-6950X isn't cheap but will be unbeatable. I would go 64 GB of RAM and add two of the latest PCI Express SSDs - costly but with 3GB/sec throughput vs 500 MB/sec of a SATA3 SSD - that is six times the speed.
If your software can use Direct Compute - well a uber powerful NVidia GTX 1080 gaming video card makes huge sense - having 2,560 processing cores will lift your imaging processing beyond belief (I have seen video of 4 GPU monsters doing real time x-ray tomography - using specialised software to handling the 10 TB/sec processing load across the 10,000 ALU cores).
I would expect most image processing software doesn't yet take significant advantage of the huge parallelism inherent in modern 3d accelerators - writting decent shader programs still isn't all that simple - give it 3 - 5 years.
I would add get a great - high quality power supply, case and motherboard - and the 30" Kogan monitor is a decent thing to initially pair it with!
You could probably build or buy a rig that for $2K - $3K could do most of what you want - but you could double or triple this spend easily depending on how much headroom you need in your processing capacity, how important your time is to you, your budget and where you need to spend $ to get real world returns.
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