It's really hard to say what will happen after futures gets launched (which is tomorrow). A lot of people is expecting a very big correction, from a 20% to 50% decrease in price, so it could be worthy to wait a little longer, and get bitcoins at a cheaper price. BTC is still very close to it's all time high, and still way ahead from where it was in just three days ago, so the correction everyone is talking about wouldn't be that strange. Of course we all know that BTC is very unpredictable, so I guess that the wise move would be to maybe invest half of your funds in case BTC goes up, and then decide what to do with the rest.