Year 2014 offers plenty of options where one could invest 50k. It all depends what investment vehicles you prefer and what kind of return on your investment you expect.
How about 100% p.a.?
Fancy that? Ok, in that case I recommend you to read an article about How Can Average Joe Double His Money On Forex Market?
I believe that will give you one interesting idea about best thing you can invest your 50k on.
...did you know that by auto-copying a simple forex strategy, using a power of compounding and some time you can turn a small investment into millions?