I reckon this to be a great start, especially since you obviously know to also have the majority of your holdings in those top 10 coins - except, of course, none of the fake crypto currency, XRP, eh?     

Go-go-gadget-predicting future prices....  Errr..  The gadget isn't working today..

Well, in lieu of relying on gadgets, let's rely on my experience instead.  I suggest that instead of going out and putting more money into the projects you're already holding, why not find another project that you can throw $200 at, that has a relatively low supply and has the potential for decent price movements in 2018.   I think $100-200 in well put together projects that maybe are outside the top 75 in marketcap and with token / asset supplies under 400 or 500 million have a decent chance at accomplishing this sort of thing.   Grab a few platform projects, a few privacy coins and a few exchange tokens (ie. BNB, KCS or HT; which is coming up soon for Huobi). 

There truly are a ton of projects out there getting ready to launch their products in 2018, so those should be at the top of your list!