What will you be doing with this PC? Be as specific as possible, and include specific games or programs you will be using.

Gaming is the top priority, Fallout 4 modded, Resident Evil 7, Total War: Warhammer, X-Com 2. Witcher 3, ect. at high to ultra settings.

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

700-800 willing to go up to 900 if it makes a significant difference

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 Note: beyond a week or two from today means any build you receive will be out of date when you want to buy.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)

The PC itself, tower and guts, and an OS. I already have everything else.

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?

United States, NM, no microcenter nearby.

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

Will be running it through a HD TV and have wireless mouse/keyboard.

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

Maybe in the future but not a priority

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) Large HDD and a SSD for the OS.

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?

Nothing huge.

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

Yup.