You probably got all the opinions you wanted in this thread, but I figured I'd throw my $0.02 in here.  If you have the above coins in good supply, you're good as far as I'm concerned.  If you or anyone else are looking to pick up some alts from the list you made, I'd probably go with at least dash and monero.  Skip ripple and most of the others.  Even if they're high up on coinmarketcap, a lot of them are just dogs in my opinion.

There's so much out there that even picking a decent selection of 15 can be a challenge.  One thing that I've been thinking of doing lately is buying a 'shotgun' portfolio of a bunch of alts, a little bit of each.  It would be sort of like playing the lottery, and tickets right now are looking pretty cheap to me.