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Uh... no. If I wanted to play games, I would have invested in an actual decent FX card rather than the cheapest POC I could find that would allow me to run D3D. I use Windows for three small applications whose authors never bothered to write Linux software or ensure Wine compatibility. Two of the three are pieces of software that came bundled with specialty USB devices.
As for me being a "Linux whore," I don't pay for Linux, and Linux certainly doesn't pay me, so I think that analogy fails.
That's like saying I "own" the variable "x", and that all graphics programmers now need to pay me to lease use of that variable name.
Ah, okay. Well I'll share with you my current build:
Ubuntu 14.04 LTS
Intel i7-4790K CPU: $340 (I was gonna go for the i7-4770, but MicroCenter had the 4790K on sale for $280, and I jumped at it)
Gigabyte Gigabyte GA-Z97X-UD5H: $165 (make sure you upgrade your BIOS to version F8--with F6 it was rebooting every couple of minutes)
Corsair Hydro H60 cooler: $60
SeaSonic 650-Watt G-Series power supply: $100 (WAAAY overkill for my system, but whatever. I chose it based on Tom's Hardware PSU tiering guide--wanted something close to the top with 600+ watts at less than $100)
G.SKILL Trident X Series RAM: 2x8GB for $165
SSDs and HDDs are kind of a personal choice in my opinion. I only buy Samsung SSDs and only buy WD HDDs, but other people will swear by different brands. SSDs are at about $0.50/GB
My case is the Cooler Master HAF-932, which has a metric ton of fans, great access ports and a large footprint. I think they've been discontinued in favor of the HAF-X: $170.
You might not need a dedicated GPU with that CPU/mobo combo--I only use it to run Direct3D on a Windows VM and run my displays off the IGFX. Depends on whether you're a gamer, in which case, consult your games for the recommended specs. I can tell you nVidia cards usually work decently well, but you have to futz with getting the correct drivers (proprietary vs. nouveau) and getting everything to play nice in your xorg.conf.
Any optical drive will do. I think mine cost $20. Make sure none of the online reviews complain of bloatware.
Keyboard, mouse, monitor--anything should be fine.
I think that's it! Total cost comes out to ~$1200. But it has top-notch performance regarding stuff like video editing and scientific computing. Linux compatibility is fine, though you'll need to use the alsa-daily PPA to get audio working, and a dedicated video card can, as previously stated, take some work to set up.