I have $10K burning a hole in my pocket, so I asked how much USD a "$10K mining rig" would make/month.
Nothing you can get now will have the kinds of get-rich-quick payoffs we had in years past.
With $10K and 6 S9 you can start earning around $700 every couple of weeks, and if the difficulty continues to rise every couple of weeks by 6%, and not faster, you will just manage to break even on your investment in a year or more, unless the price of BTC rises even higher (but if it drops, you won't even return the original $10K). May be it will be more profitable to invest half of that amount in a basket of upcoming altcoins or even precious metals for that matter (like 2oz of gold, 50oz silver, 2 9s and some new alts) and see what does better in a couple of years.
Giving it a 2nd thinking, just buy 4 Antminer D3!