i see the future. ether will be 1k$ in 2018. 
update: stoppp ittt. i didn't buy
update: stoppp ittt. i didn't buy
Do not put all of your eggs in one basket this is one of the golden rule in investing. Except if you are 100% that the price will go up before this year would end then go on and buy a lot of Ethereum. Anyway, this coin is 2nd to Bitcoin so at least your investment is at low risk but better if you split your investment to other coin like Bitcoin and for sure you have minimize more the risk.
If you can afford to loss all your money in crypto world, It's okay. But if you can't afford to loss that money, then dont. I say this because, any amount you are going to invest, big or small amount are both gives you the risk to lost them. Nothing is stable in crypto world, anything can happen to your money, just hope for the best.