According to what is going on this brand new market, my prediction for three main currencies is:
GOLD: BTC (BitCoin)
End of 2017: $10,000
End of 2018: $50,000
SILVER: ETC (ethereum)
End of 2017: $900 ~ $1000
End of 2018: $5000
BRONZE: LTC (LiteCoin)
End of 2017: $125
End of 2018: $325