Most of the coins mentioned are large cap (safe bets) so I'll recommend some mid and small caps (greater risk but much greater returns)

Substratum
PayPie
Bluzelle
CloakCoin
DigiPulse

I believe there is a place for alts.  Many alts solve problems that current legacy platforms cannot do or address new needs that arise with the rapid adoption of cryptocurrencies and blockchain applications.  Many alts are also useless so due diligence is required.  These are some coins that I have held or currently hold.

PPT (Populous) is one alt that solves issues with liquidity issues with SMEs.  PPT will grant SMEs access liquidity they can only dream of right now. 
DGPT (DigiPulse) is one alt that solves the issue with digital asset inheritance.  What happens to your crypto when you pass on?  With DigiPulse now you can leave your assets to your loved ones.
SUB (Substratum) solves the issue of internet censorship and blocked access even with the use of VPN's.  Packets running on the Substratum network look exactly the same as normal packets so access cannot be censored.
OMG (OmiseGO) solves the issue of banking the unbanked and providing an ecosystem with no centralized entity in control or at risk.

You just have to do some research on the team, concept, and their solution.  Then you can make an informed decision on whether you want to make an investment into a certain altcoin.

Hi guys, I just started writing on steemit about cryptocurrencies and wanted to share some thoughts on the forum as well.

Cryptocurrencies have enabled an enormous amount of wealth transfer and what happens all those newfound gains when you pass on?  This is where DigiPulse comes into play.  While there are several competitors to DigiPulse, their ease of use and business model is what I believe will make it stand out from the crowd.  I will keep this post short and sweet and include a link to a steemit article I wrote.

DigiPulse has recently launched a public Beta that I recently tried and went through the entire process of setting up my own vault as the vault creator as well goes what the inheritor will go through to claim your digital assets that you left behind for your loved ones.  For a Beta I was rather impressed with the results.

One simply signs up for the service.

create a vault or vaults for multiple inheritors
drag and drop files into the vault
fill out the inheritors information
set the inactivity time frame
decide how you want to pay (as you go or in advance)
(optional) 3rd party services integration to keep track of inactivity

You can sign up and test their beta by visiting.
https://app.digipulse.io/auth/sign-up

This is just brief overview of what I wrote in my steemit article and you can continue reading if you are interested
https://steemit.com/bitcoin/@cryptohodr/digipulse-the-first-digital-assest-inheritance-service