well my top 2 altcoins:

1. Ethereum as the top 2 cryptocurrency  in coinmarketcap with 28 billion ether has a growing community comparable to the bitcoin community and also it is famous because of erc20 contracts which enables to developer and the company to develop their own coin under the ethereum blockchain and also ETH is good to keep in your portfolio since it is stable coin.

2. Litecoin as bitcoin's little brother, we all know that litecoin price hasn't moved a little bit over the years but now it stands on $100 line so it will be good to put it on your portfolio

i prefer monero and minex to do trading because hargany is very nice and easy to take a chance. so it is easier to get profit I think the coin is very good for future investment.

Monetha is starting to get some good support and so is Substratum. Both newish coins on the block but have long term roadmap so be prepared to HODL.

There's one hour left in Cashaa's token sale. It's number 12 of the 100 most influential blockchain companies, between Kraken and Bitfinex.

I would suggest Ethereum and Dash. There are a lot of apps being created on Ethereum, which will surely rise the ethereum price by end of this year.

For investment point of view, you should keep most of your investments in Bitcoin, Ethereum, Dash and Litecoin.

My top coin right now to invest in is Neblio. Research it's use cases, current progress (wallets, nodes etc), it has a 10% per year staking. Check it's progress then work out it's marketcap. For where they are right now, if you look at their competitors markep cap, even at $10 per coin this coin imo would be undervalued as it would still then have around $130 million marketcap.

Monetha? Wait a moment... i thought this was big scam. Ceo was stripper and cto hasnt programming skills. That what i red some time ago

so who's getting the 3rd?

Definitely those great coin will surely make good money for you in the future, So I will go for this two giant coin If I invest today. But again always depend on your trading strategy, always do the homework for you to win in this kind of market.