I think that currently you can calmly invest in BTC because its price at the moment is relatively low, however I don't believe that its price will fall below 6k$.
I am thinking also about that. Price is not so high now. Anyone can catch this price easily. After some days, price will be growing very fast. So this the right time for investing. Anyone can buy bitcoin as possible on budget.
Anyone can buy now but always be careful if the project will succeed, it's getting harder for ICO to be successful in this bear but we should appreciate projects and company that worthy enough to put risk with.