I feel like you might be overshooting your preferred setup a little bit. An emulator setup doesn't need to be so powerful.
An FX 8350 (or 8320, 8370, or the 'E' editions of any of the 3) and an ASROCK 990FX Motherboard will be more than capable for your setup, and will cost less combined than just the chip you want for your board.
An R9 390, and a GTX 980 ti are going to be literally identical for any purpose you're using it for. Both are probably insanely overkill, and you could go so far as buying a 7870, r9 270, or equivalent off eBay for insanely cheap. Though, you do say you want more, so I'd suggest you look for an R9 290 4gb, the 8gb's of ram will never be used, ever, no matter how far in the future you go, you're unlikely to even break 3gb's, and when you do the card will be outdated it won't matter.
Windows 10 is almost entirely compatible with Windows 7 programs, its worth upgrading through and through if you have modern components.
Take any extra dough and splurge it on the nicest case you can afford for the form factor you desire, peripherals like cases, headphones, mouses, keyboards, are the most important things to consider purchasing as they will likely /NEVER/ become outdated. A processor, graphics card, and motherboard, will age extremely quickly, so its best to avoid spending outside of the price-performance hotspot UNLESS you specifically need the power.
