Hi there. I just want a shot at your 0.5 BTC because I think I can get it.
The best thing for a good ROI right now with low risk is that to buy gold. If you check out what China is doing right now, you will understand why. They know that the dollar will default soon because the Federal Reserve is printing money like never before. Thus inflation skyrockets and the ~8000 tons of gold aren't enough to back up the dollar, and the huge debt. Lately, from 2009 China imports gold and is minting gold from Africa, Europe, everywhere. The Swiss said that they are running 24/7 for a year now, smelting gold bars from the back of the deposits, melting bars from the '60 to supply the hunger of China
http://www.arabianmoney.net/gold-silver/2013/12/08/secretive-swiss-gold-refiners-have-struggled-to-provide-40-tonnes-of-gold-a-week-for-china-or-2000-tonnes-this-year/ . If you look at the reports of Hong-Kong and China, they have around 6000 tons of gold stacked up until now, but the gov. doesn't say nothing official about the imports. They are importing around 2000 tons this year and this is only what we know about it. They are announcing on the national television and urging people to buy gold and silver.
http://www.ibtimes.com/chinas-central-bank-may-be-stocking-gold-report-1543333 and listen to this
http://www.noblecoins.com/Gold-and-Silver-Investment/Gold-investment/china-promoting-buying-of-gold.html . They want to back up their current money with gold when the dollar will default. Also gold and silver are -70% of the value what they usually are but the downfall of all of this is that you'll have to wait. It is a sure win.
A investment with a higher risk is what nobody has right now. Building an exchange in a fiscal paradise like Netherlands, Ireland, British Virgin Islands etc. There are some in Africa too, you won't have to pay taxes and the gov helps you build your business. A crypto market with low fees for the rich will ensure you a gateway thru which they can invest in the cryptocurrency world. Think about that, help them to funnel their money thru your market. Help them be more anonymous. I think that this is the best opportunity for them to diversify their portfolio with you offering exchange from gold to usd, jpn to cny and the Russian ruble. You can implement margins leverages etc like a real Forex market only that you must back up that leverage with BTC and you don't go on red. An exchange market where people can deposit with little, under 1%, or no fee and withdraw in most of the fiat they like with no tax on profit and high level of anonymity, this is what I call a sure success.
If you would rather think of these two investments opportunities and have a profit consider donating under 1% here 13u72xsQEAk4rSw4VBkZ237bUqEeq3kY23. Thank you for reading.