That's kind of what I would advise as well at this point to anyone looking to get into it....roughly 10% of your portfolio at max. Ripple/XRP seems to be the most intriguing to me at this point however....it's main purpose is to be used by banks to quickly transfer money internationally, it's been overall resilient (more than any other coin at least) to market dips/crashes, and it's being rumored that Coinbase will add it before the end of the month.....and if that is in fact the case, the price will go up exponentially.
...but I also think Bitcoin is just at it's entry stage, as exchanges progress in technology, security, and support I think Crypto is going to do well.
So that's my little teaser
Still, as you said, a high risk investment, definitely not a blue chip stock.