Don't put all eggs in one basket.
Wise advise to anyone who is looking to invest their hard earned cash.
I would recommend you to invest around the 15k in bitcoins and the other 5k in other investments.
As a example you could invest the 5k alt coins to later make more profit by trade them.
15k invested in bitcoin would be nice to have right now with the way the price in going.
I just couldn't see myself investing in any alt coins, if your lucky that is probably where the big quick money is but unless you get in before the pump and out before the dump you have a good chance of loosing a big percentage of your original investment.