I have been doing mining for 1 year using Asrock H81 pro btc R2 . issues I've experienced:
1. When booting, Ram isn't detected, I did Move the DIM1 slot to DIM2 or vice versa. (solved)
2. 1 or 2 GPUs aren't directly detected but they can be solved by trying to move PCIe slots to other PCIe. (solved).

Gpu should be flashed Otherwise He will get 24-26MH/s

I have this card bought last year, its a bit pain modding them because of 2 mem types, so copying straps basically don't work for me, though there is already one click button for polaris editor that has been released though I don't try it yet.




yes, I have this PSU also in my 3 rigs handling 4x RX480's, it sure could handle those 3.

I thinks good for mining is GTX series 1080 my advice
but I never test 580 series
how about performance?
that must be cheaper than gtx 1080?

 Instead of asking for advice in here of how to invest your 10k in mining, why don't you try to hire someone with real knowledge and experience to make you a business proposal. 
People in here are giving you opinion which is not sound investment advice.  Some people don't even know but they are advising you anyway.
 There's a guy in here who does hardware reviews and how-to's.  There's another who hosts miners and builds his own. I don't know if they would do this for you but it wouldn't hurt to ask.  It would be money well spent. 
...or you can continue on your present tack and waste your time and money.