My top 5 are:

1.Bitcoin - the king you need to have it so you can buy other coins.
2.ETC - seams quite undervalued compare to the rest of the top caps and with ETH switching to POS at some point in time, this might be as good a time as any to stock on ETC.
3.IOTA - risk/reward still seams pretty good on this one considering it might be a next level crypto with many use cases. The team that is forming behind it is also top notch. It will do wonders in 2018.
4.Tezos - insta 3x out of the gate, need I say more? If you are on twitter prepare for a lot of Tezos in 2018.
5.DigiByte - DGB is still vastly undervalued, considering it can do what BTC and LTC can do and then some more. I fully expect DGB to go over 1Bil cap in 2018.