Which processor? I did all options on max. 4,2GHzI7 up to 4,5. 2TB flash HD, Radeon pro 580 8g VRAM.
Why: You can't replace items after you buy. I like speed very much. I can sell my old iMac. I had a lot of good clients last half year.
The whole configuration is (without tax) around € 4.000,- (without memory what cost me seperate € 600,- for 64GB).