DeepOnion is at the right time to stock for your cryptos investment portfolio.
Current sitting at 2 to 3 dollars mark, it will quite easily doubling the price, but I suggested to hold for as a long term investment till seeing at least a 2 figures price range.

People would compare ONION with some top listed cryptocurrencies like Monero, as both having quite the same set of numbers, XMR is a few years old, ONION is only a few months young. Smart investors all seeing the potential goes to ONION is the fact with no doubt. Plus the Devs team and the community behind the project is huge.

To keep this short, why not check it out at their officials to find out more.
Good luck

 Ethereum and litecoin are just two of the best altcoins to invest because they are good for long term investment. The recent price uptrend of the two altcoins proved that their future are promising and they have a lot of rooms to grow. This two altcoins will continue to seek a new level in the coming years.

Yes
Monero is a wise victory option I think, many are discussing it this month.

Six months is a long time for the rapid growing market, Six month ago the price of btc is only $3000, and now it is $11780, so I think it is better to invest in btc and eth.

How much room does Cardano have left with such a huge supply? The market cap is already 5 billion, even if it gets to Bitcoin size (and it won't, maybe it gets as high as Ethereum) Cardano won't make you a millionaire. About 60x is not enough for that.

You should know, that when bitcoin climbes so much, other currencyes follow, Even DGB-digibyte has gone up, and they have plan of unlimited supply...I really can't grasp how much will DGB rise because of that, if any... Best to invest now I think is only bitcoin and monero or if you wait for bitcoin to get down, witch may never happens again. But transaction fees on bitcoin are crazy, I put on low fee and it doesn't even go trough... and it's like 3-4$

For me, Top 2 Altcoins right now are IOTA and ETC, IOTA good for long term

Monero is always my favourite and if it was for me, I would definitely but Monero as much as I could.

ETH and DASH are the most trusted crypto-coins. Hope it will grow at the pace more than 5X in 2018.
Waves is also a good choice...It will definitely come on the list of TOP 10 coins in next 6 months.