Personally, i don't see silver "going to the moon" as other optimists here believe. Its manufacturing use and supposed scarcity, has already been factored into the price, otherwise the "true" price would have already been much higher than even the $50 it reached while back.
Gold has the advantage of being a traditional store of wealth, traded in and amassed by banks and governments.
Silver is speculative. Nothing wrong with that but are you speculating, trying to preserve wealth or hedging your bets and trying to do both?
As with anything, dollar cost average over time.