40% on Bitcoin and lock away on a trezor for 2 years
30% on GPU farm - you can resell GPU's after 8 months and upgrade using funds and some coin you have mined
30% on various coins in top 10 coinmarketcap to trade
Mining farm really not worth it with such a small investment.
I'd go 40-60 into Bitcoin-Altcoin instead. If Altcoin investments fail, the Bitcoin investment would still end up making a decent profit overall by 2019/2020. And if Altcoins go well, he could be very close to or beyond a million.