Any coin added to Coinbase is going to see a surge. Same thing happened with Litecoin when it was first added and the influx of novice investors made it skyrocket again this most recent time. Bitcoin Cash is the safest bet right now since it's already confirmed that BTC holders will receive their BCH but I think Ripple is likely to get added. I'm also placing bets on Monroe and Dash due to some rumblings I've heard through the grapevine but I'm not as confident in either of those.