Hi Mustachians,
for long-term investments I would recommend high-yield goverment bonds or bonds of goverment-backed institutions. I recommend these only because of their high yield, this is not for day-trading.
DE0003030516: State Bank of Baden-Wurtemberg, Germany. Still a long-running Deutsch-Mark bond, but very attractive yields. Also a prime rating, because these baks are practically owned by the German state.
XS0283199247: Bonds of Germany's Bank for Reconstruction.
I put some of these in my portfolio next to some more risky Icelandic bonds (GB0004556113) . I guess I will come close to a 7.5% overall return this year.