here's the thing. I'm someone who likes to get the biggest bang for my buck when i build a computer. my entire rig was $650 and it's future proof for at least another year. I'd have to find some decent 6 or 8 core AM3+ CPU and with Ryzen being release, it might be wise to upgrade at least the CPU.
For now, the difference between an RX480 (which i have) and the 580 is the 580 is everything that they wanted in the 480. So differences come down to manufacturer. I believe the most money you should spend on any given component should be the graphics card. My card is VR compatible at 4gb GDDR5 memory and theoretically should be able to play Elite:Dangerous in VR. I just need more cores on my processor. Choices then boil down to an 8core upgrade or a high end paintball gun....
I'm not big on nvidia or Intel because again, i'm a cheapo. My 4 core AMD/Radeon setup does me just fine for the amount of gaming i actually do. I always recommend that you build a computer based on how you're going to use it THEN figure out how much you wanna spend
As far as my other parts go:
Asus AM3+ board. sadly, no hookups for front mounted USB3
Coolermaster 212 Evo CPU cooler (one of the most common CPU coolers)
Thermaltake 600w PSU
1x1tb Hard Drive SATAIII
LG DVD-RW burner
Corsair mid-size case
Peripherals:
Element 40" 1080p HDTV via HDMI
Samsung 23" 720p HDTV (Secondary) via hdmi
Blackweb Keyboard (walmart crap)
Logitech mouse (ancient)
Dell 3pc Speakers (ancient but still shakes the house)
Wired Xbox 360 controller
PS4 USB Chat headset
iFrogz earbud headphones