Just take $100 and put $10 each in 10 of the lowest priced altcoins.  It's like throwing darts.  No one knows what one is going to pop next so spread your bets with a lot of small stakes where you can get a lot of coins for the money.  And hey, it's only $100 .

More likely, the following scenario will occur on 12/18 when futures start trading:

There will be an initial rush (especially from Asia) to buy.  Expect that BTC could quickly go to the $25K-$35K range. There will also be a lot of media hype.  Only after that initial surge will short selling start and a resultant real roller coaster ride for those that can trade fast.  IMHO.