Building a PC out of spare parts I already have

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 solely playing games on this. Fallout 4, rocket league, and such.

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

as little as possible, without bottle-necking. basically just the minimum needed to turn my spare parts into a pc! I guess I would say $300 max budget.

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 Note: beyond a week or two from today means any build you receive will be out of date when you want to buy.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. I'll probably order parts this weekend.

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

Copy of Windows, CPU, Motherboard, RAM, SSD

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?

MN, United States. I do have access to Microcenter.

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

Sapphire r9 270x 4GB, Cooler Master Mid Tower Case, 500W 80+ EVGA PSU, mouse and keyboard, xbox controller, and a 720p TV.

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

Not overclocking.

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)

SSD would be nice. not much capacity is needed, as I will ONLY be using the system for games. a 250 GB SSD would be perfect size.

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?

No preference. I already have a case.

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

Yes. Windows 7, 8, or 10 (will upgrade to 10 right away, if 7 or 8 is cheaper)

Extra info or particulars:

I just have some spare parts laying around, and I'm wanting to get the extra parts needed to finish a whole PC to use in my dorm room. My TV is only 720p, so my r9 270x should be quite comfortable. I'm mainly just not sure what CPU to pair with it.

Submitted by ATealAmoeba Xbox 720 Release Date 2015