I think if you have a big money, then you can choose bitcoin only because I think with buying bitcoin, you can make a bigger profit than other coins. but be careful because if bitcoin price is down, you will see that you can lose much money. the other coins that will be good to buy are ethereum and this coin is not too expensive right now so you can directly to buy in the exchange. actually, there are more coins that you can buy at this time because the price is still in a downtrend so you can choose more than 10 coins at the one time. but I am not suggesting to buy more than 10 coins because this will makes you confuse watching and analyze the price.