[Build Ready] Would SteamOS be a good choice for my as of yet unbuilt gaming PC? Plus general feedback

Build Help/Ready:

I'm building my first PC this Christmas break and have already purchased most of the components, but I have a couple of questions about setting it up. First of all, the purpose of this PC will be gaming only (I have a laptop for web surfing, etc) and as a result I think purchasing an actual operating system isn't worth it. As a result, I was hoping to install SteamOS on it, but I'm not completely sure this is my best option. My concerns are: I've heard that SteamOS doesn't play well with the AMD drivers/Radeon graphics, would this be significant enough to cripple the PC's capabilities? And, I was hoping to use this wireless network adapter, which is claimed to work with Linux, does anyone know if it would be compatible with SteamOS? Any other feedback/advice would also be appreciated (I know I don't have a GPU, I didn't want to spend too much on my first basic gaming rig and was told by a Micro Center associate that his advice would be to get the A10 instead of a cheaper CPU and separate GPU at my price range [was originally considering a Pentium and a GeForce GT 720 or similar])

Have you read the sidebar and rules? (Please do)

Yessir

What is your intended use for this build? The more details the better.

Light to moderate gaming only, will spend a significant amount of time hooked up to my TV with xbox/steam controller

If gaming, what kind of performance are you looking for? (Screen resolution, FPS, game settings)

720-1080p (not a huge deal), 30+ fps, on medium to high settings for cs:go, rocket league, Skyrim, sleeping dogs, etc

What is your budget (ballpark is okay)?

$300-400 (already purchased $254.95 worth of parts, the rest will go towards a monitor/an OS if SteamOS doesn't work out

In what country are you purchasing your parts?

USA

Post a draft of your potential build here (specific parts please). Consider formatting your parts list. Don't ask to be spoonfed a build (read the rules!).

PCPartPicker part list / Price breakdown by merchant

Type	Item	Price
CPU	AMD A10-7850K 3.7GHz Quad-Core Processor	Purchased For $109.99
Motherboard	Asus A68HM-E Micro ATX FM2+ Motherboard	Purchased For $9.99
Memory	EVGA SSC 8GB (2 x 4GB) DDR3-2400 Memory	Purchased For $44.99
Storage	Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive	Purchased For $39.99
Case	Rosewill R379-M MicroATX Slim Case w/300W Power Supply	Purchased For $49.99
	Prices include shipping, taxes, rebates, and discounts
	Total	$254.95
	Generated by PCPartPicker 2015-12-12 00:00 EST-0500

Provide any additional details you wish below.

Thanks for taking a look!

NOTE: You do not have to follow this format, but please be sure to answer these questions. Please do not ask to simply be given a build. You are welcome to delete this section.

Submitted by SnapuSwiperNoSwiping Xbox 720 Release Date 2015