If you have 10000$. It's better to buy ethereum.
Other than ethereum you could look into dash which is starting to go mainstraim as it becoming the prefered crypto for some services Quote
2018 is the year of ethereum 
We are not far from 2018 and so far so good most altcoins all seem to be in the greenQuote
Buying bitcoin next year wont give you alot of profit. It might increase in value but not twice its base.
Best of luck
Bitcoin is unpredictable, who knew we could see 17 grand in december...sometimess we just need to go with our gut feeling when we want to invest and for me bitcoin is still on my to bucket list Best of luck