I'd still be waiting a bit for ETH to establish before jumping in. If you watch the graphs for the price of ETH in last 3 months, it's steadily decreasing and a line drawn on the changes would put it's price much lower than the last weeks depression. Though anything below $250 would be a buy as we are having a jump after a fall.
with what you convey is very true the strategy for investing in crypto currencies in my opinion at any time it can buy ETH or other crypto currencies if indeed we are ready with all the risks and already have the confidence to invest bring profit