Ethereum is a proper investment choice. However, it is essential to study the rates before any determination of cryptocurrency is made because it fluctuates with time. Ethereum is quite promising, and many people are coming on board for this investment as it continues to grow very fast. With Ethereum money will be secure, transparent and easily transferable across countries.
Actually, ethereum's price against bitcoin is quite stable and the reason why it's getting a decreasing price is due to bitcoin's price falling as well, but the ratio has been quite the same for almost 3 weeks now. So i suggest if OP wants to buy ethereum and does have a bitcoin i think he should wait for the ratio of ethereum to bitcoin to fall down so that you he could get a lot of it although buying ethereum anytime for long term purposes is valid.