Your selections are good, that is also in my direction but not as many as yours, if you need to add more then do research on the first set of coins on coinmarketcap but I really do not like holding too many coin, so as to be able to follow updates about them, also to know when to even add more or sell.
Sometimes buying too many coins is not a good choice, but everyone has their own way and strategy in investing. But for myself I agree with you that I don't like investing in lots of coins and prefer to focus on a few coins that I think have the potential to generate profits according to what I observe.
Some people prefer to buy many coins because they think that way they are protecting their investment but in my opinion they are doing nothing like that, most of the time they are only increasing the risk because most of the coins in which they decide to invest are icos or new coins that as we know are not having a lot of success in the market because investors have lost the confidence in those coins long time ago and instead of earning money and protecting the money they have they lose money instead.