Thanks for the response. I've decided that I will build a gaming PC and maybe add some extra graphic cards on. The prices are crazy for most graphic cards at the moment.
You can use the old board (the cheapest one) instead of gaming board if you plan on mining. One of my Rig use old Gigabyte board (M2+ Socket) with 5 PCIe, bought that around $17. Trust me, didn't give any difference with Asrock H81 Pro BTC (I have this board also).
Thanks for sharing. I'll be taking that route then. Just have to wait for decent graphic cards prices and a bull market.