Participating in the Bitcoin market as a miner and then as an investor for 8 years I watch the market daily. And as many of you have already determined the ALT coin market value increases as Bitcoin market cap increases. Bitcoin at this point in time is relatively expensive to accumulate so I would suggest looking at the ALT coin market to benefit from Bitcoin's move up.
Some coins I would consider are:
Dogecoin - It is one of the early coins and has steadily increased in price over the years and is extremely inexpensive at this time.
XPD (PetroCoin) - backed by petroleum, longer track record then most coins, 60% down from its peak from where Bitcoin corrected.
Tron - Newer coin, lots of buzz. Consider a lottery ticket and not an investment.
Remember crypto is EXTREMELY volatile and don't invest a large amount you are not ready to completely loose if the crypto market goes to zero. The nice thing about these coins is that for lunch money you can be positioned well and if it does go to zero you wont get hurt in the wallet too bad.