Linux, 3D printing, Blender3D, Skype calls

What will you be doing with this PC? Be as specific as possible, and include specific games or programs you will be using. I will be using this computer for work. Writing emails mostly and making professional multiple camera skype calls. I have been using Linux for over a year. I also use 3D printing software (know as slicing). Blender 3D (mostly modeling). Arduino, Python coding. Never built a PC. Have built several 3D printers.

What is your maximum budget before rebates/shipping/taxes?

$1200

When do you plan on building/buying the PC? Note: beyond a week or two from today means any build you receive will be out of date when you want to buy.

ASAP

What, exactly, do you need included in the budget? (Tower/OS/monitor/keyboard/mouse/etc)

Tower

Which country (and state/province) will you be purchasing the parts in? If you're in US, do you have access to a Microcenter location?

Pennsylvania. Microcenter is hour away.

If reusing any parts (including monitor(s)/keyboard/mouse/etc), what parts will you be reusing? Brands and models are appreciated.

Dell 2k monitor

Will you be overclocking? If yes, are you interested in overclocking right away, or down the line? CPU and/or GPU?

I need this to be a workhorse.

Are there any specific features or items you want/need in the build? (ex: SSD, large amount of storage or a RAID setup, CUDA or OpenCL support, etc)

Open GL, SSD

Do you have any specific case preferences (Size like ITX/microATX/mid-tower/full-tower, styles, colors, window or not, LED lighting, etc), or a particular color theme preference for the components?

Robust and functional. Size is not much of a concern.

Do you need a copy of Windows included in the budget? If you do need one included, do you have a preference?

Linux Mint

Extra info or particulars:

This will be in a dusty shop with 2 barn cats.