Im buying now, but holding for the long term, I'll buy more as it comes down, and but more as it rises, truthfully, I think eth has a good chance of being a real problem for bitcoin and its value.
But I wont sell all my btc for eth, just some because surely btc is not done yet.
Good luck. I've still got some in (about a quarter of my original stash) but I'm not buying. The emission is phenomenal. Even if it held its current marketcap, the price would have to tank by about 20%-30%. The finale is Monday - thats when the big launch is. Watch out for the news being sold.