Today and a few weeks I will not suggest to buy, just wait a little, when the halving of bitcoin will be near there will be much less people in the other coins and everyone will be busy to buy bitcoin, so at that time Ethereum will reach to much less amount. Just see the near future will be about $1 per ethereum.
You don't subscribe to the theory, BTC rising will cause all boats, to rise to some degree as well?
I don'T see how alts can keep up with BTC as far as the ratio between the two goes. Yeah, they might pump with BTC but I feel when all is said and done, these coins will be valued in USD (especially once you can send money to a big exchange and buy any alt, and that is coming due to coming regs imo.)
There will be speculation on things like ETH, LISK and other promising cryptos but I would not go all in on a big BTC rise (well, watch and follow the trend might be safer.)
That said, once the masses jump on board they might jump onto what they can get more of...
IAS