You should really consult a currency broker, an investor, or your financial adviser.
The fact is, if you have to ask on this website, then it probably isn't best. You really need an understanding of inflation, GDP, and basic economics and the currency market to invest. And even if you did invest (assuming a little amount), you wouldn't make a huge amount of profit.
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.