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CPU: Dual Xeon "2" series (for dual) with maximum speed, then maximum cores. Once you get to 6 or 8 cores, there is little benefit in going to 10 or 12, whereas the higher speed will definitely help. As of 2016, the "W2xxxW" series of Zeon processors I think indicate "Workstation" and these are the best choice.
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Monitors: The new standard is 34inch 43 inch 4k (ell Dell P4317Q), which ahs has the same dot pict pitch (pixel size) as the old 30 inch monitors. I have combined a 43" 4k with the widescreen Dell 34" and that is nice.
Data drives: again, Dell often won't provide the largest drives, so I usually order with the smallest possible 3.5" drive (so the connectors are all set up) and replace it with the largest available SATA drive; choose a fast 7200 rpm drive.
Windows: Windows 10 is fine, and is needed to support memory over 196GB