Well thats a very personal decision, and it comes after some research and knowledge of the market and specifics relating to other coins available, bitcoin is a pretty safe bet, but I would watch the market closely and make sure to buy on a good low, then continue monitor the market and sell on as profitable high that you can, you may have to leave it sit for a while, or it could always possibly explode in minutes, if anyone could accurately predict the market, we would all be filthy rich, so I suggest you do your homework and make as much of an educated decision as possible, pay close attention to your comfort level and take in as much information as you can, and decide which information you trust the most and discard the information that you don't feel is as worthy, but never buy any coin with money that you don't wanna lose.