BTC is not a Alt coin and OP asking for 5 best altcoins you need to give 5 other coins names here

1.Vertcoin
2.Wordcoin
3.Peercoin
4.Maybe Bitcoin

and monero ?

my top 5 :

1/ Shadow
2/ Nxt
3/ Monero
4/ Blackcoin
5/ BTCD

1. Dogecoin DOGE - for its community
2. Monero XMR - for the full anonymity and the dedication of its devs
3. Heavycoin HVC - for its innovation at that time. I really hope it will not die.
4. MidasCoin - the idea behind it sounds good and plausible. But it's too early to know if it's a scam or not.
5. --- this is a free spot for now.

Nxt
Nxtty
Ether
Monero

Nxt
Nxtty
BTSX
TOKEN )))

When you just ask about some investments without explaining why:

1. NEM
2. NXT
3. NXTTY
4. NODE
5.  -

Bitcoin
DRK
XMR
LTC
BTS

(1)  BTC - still dominant, could change within 6 months
........... - you will never see velocity or $10,000, but it's a core holding like gold

(2)  LTC - scrypt far from dead, 2nd most secure coin, better value than BTC
........... - it's about security, security, security, stupid... could double any time

(3)  NXT - dodgy or not, this will fly, *** hit "simplicity sweet spot" dead on ***
..........  - any small businessman can master NXT and launch an IPO in weeks
........... - despite being effectively controlled by ONE PERSON, NXT Asset Exchange is taking off
..........  - all other Gen 2.0 are either useless (XCP) or too complex for non-engineers (XRP)
..........  - biggest problem is centralization, US govt could shut it down in hours

(4) BC... - amazing PoS story, great community, BitHalo

(5) VIA.. - 2 world class developers (drak/todd) will figure it out
...........  - told you scrypt not dead, when PoS and Gen 2.0 assets start blowing up, PoW makes BIG comeback
...........  - 24 sec blocks, designed as currency, not e-gold for hoarders like BTC

BONUS

(6) CNMT - will be major players on exploding NXT exchange and, of course, jl777 heavily invested