Yes,It is a good time to buy, if bitcoin spikes after August 1st as I suspect it will, Eth will gain a bit too. They may be two separate coins, but their price seem linked at least for now.
It is probably a good time to invest in Ethereum because a few months ago its value had fallen and now
again its value is $ 630, so it would be good if at least it maintains its value, since people expect
make it a stronger currency. I think that many investors will buy Ethereum to join the ICO and its value will increase.