five altcoins that I should choose to hold for year are
1. ethereum (ETH)
2. bitcoin cash (BCH)
3. dash (DASH)
4. monero (XMR)
5. litecoin (LTC)
although the price of these altcoins are decreasing, they have potential rising after a year. one of them is ethereum, it is crowdsale.
The list is pretty good but i will pick.
NEM
IOTA
COSS
LTC
ELECTRONEUM
They have great potential for 2018.