If you have a huge budget to invest, I suggest you buy 1 bitcoin. Because of the volatility of it's price, it can increase rapidly but it can also dump so hard. But as of now, the price of bitcoin seems a little bit stable and it's also rapidly increasing. So I guess now is a good time to invest to bitcoin. You'll never know how high can it reach by the end of the year. If the price of bitcoin increases continuously, you'll make a huge profit out of it. Even double the amount that you've invested if you're lucky enough.