I personally feel that now is a good time to buy alts with bitcoin, sure it might go down a bit more, but I can't see it going down too much further than it is now. In my opinion the upside has much greater potential than the downside, for most of the quality altcoins.
Although I do have 18 altcoins already, i am going to buy more. Being sure that the bull run will come this year, I want to invest in the cryptocurrencies most of the money I have. Hope, the return will be great.