Bitcoin and Ethereum are both the most promising and will surely give you good return of investment after few months or even longer or a year. It's a good choice of investing Cryptocurrencies that has been proven and stable.

For me best two option in alts are Ethereum and Monero. Simply Because of their progress in last few months and stability.Stability in the sense there is no drastic change in price which causes certain doubts,it has grown gradually and shown great maturity. I have invested in them and and more than satisfied. I think they will be the future greats too after Bitcoin.

I can recommend you buy more waves and if you want more different coin try with monero and litecoin. Looks very good and promising.

ETH is the best altcoin there is no doubt in this after bitcoin I believe in ETH and about Monero I don't have much knowledge. after ETH i will try to hold waves. i think this coin will improve a lot in future. these are my 2 coins. apart from these coins, IOTA is best but a long term I am not sure.

Aeternity when the mainnet has been launched!
Gulden with the upcomming PoW2 update!

My only recommendation is to invest in ethereum coins, Last month it is only $300 but now it reaches $400 this is the best investment for low capital and the value will still keep on increasing as the time goes by.

No one can tell you exactly where to invest as it's your own money, but if I where in your place I would only invest in one alt and leave others in BTC. The reason for this is that you can focus on investing on a project you can truly believe in, buying all the dips and HODling until you're comfortable enough to take some profits. As per my recommendation, I strongly suggest you look at DeepOnion. It's a privacy coin using the TOR network to make transactions anonymous. With all the regulations and crackdown in cryptos lately, this coin would most likely be one of the forefront in our revolution to a truly anonymous and decentralized currency.

It's a new project that has a very large user base right now, if you check on their community at https://deeponion.org/community, you can see that it just passed the 6,000 members mark. Price of the coin had also been on a steady growth the past few weeks, signaling greater interest for both newcomers and investors to have a piece of this coin. It's currently on an airdrop right now, so if you don't have any capital to invest, you can take some time to work your way up in their requirements to get some free coins during their Friday airdrops. You can also register in the community link I gave above and participate in the discussion. You will be awarded "DeepPoints" for actively participating in the forum and this will be rewarded with corresponding DeepOnion coins in their 2nd airdrop each Sunday. Hope to see you there!

Waves starts to rise, it reached 8$ today. I expect it to go to 10$ this month and to the moon next year.

According to current market scenario I would say Stratis, Dash and DeepOnion are the best altcoins in my opinion to get good return in 3-6 month time frame. But do your due diligence before selecting any altcoin.

As you ask for now; TRIG, XRP, XMR and GAME are looking good to buy.