Yes you can invest at this level too in Ether and if you feared about price then you can invest 50% of your capital here and remaining 50% when Ether comes 1100$ level. You have seen that Ether have consist growth and Ethereum is an open software platform based on blockchain technology that enables developers to build and deploy decentralized applications.And now a days you can see many many ICO coming with Ethereum platform.So it looks Ether future is very bright you can invest.
Cryptocurrencies can be risky so only invest what you can afford to lose. Also, in my personal opinion, it is very smart to DIVERSIFY (meaning to get several cryptos and not place all bets on only one). Cryptocurrencies have a very strong network effect. The more people using it, the more utility and value is has. It is highly likely that the value of Ethereum will increase as usage increases. In my personal opinion, It is definitely good and okey to invest in Ethereum because Ethereum is growing exponentially, also has the backing of major global corporations.