Dude, this is a bitcoin forum full of people who are so bullish on btc (and desperate for it), that you're not going to get any answers that are useful. Everybody is going to tell you yes, including myself. I think despite it being at its ATH, it's still worth buying, because the bull market isn't done by a long shot. We'll probably go to $20k or higher by the end of 2018. Don't come back and blame me if it doesn't, though. It's risky as hell but it's made a lot of folks very rich.
Agree ^^^. Consider me 1 of the rest of "everybody".
If you're worried about price plan to buy slowly, at regular intervals over time. This way you're averaging your cost basis and minimizing your risk on a single point in time price.
Litecoin is an attractive option, but Ethereum has a better business model.
And rather than Litecoin better buy ethereum. Ethereum has a better market cap than that of litecoin and a better community as well. So buying ethereum is better than Litecoin.
Market cap should not be considered an driver of a buying decision. Market cap has zero influence on how attractive a coin (or stock) is for an investment. Market cap is only a measure to compare the size value (not investment value) of to comparable assets. It could be argued that comparing Ethereum to Litecoin is comparing apples to oranges, they're both good for you, they're both delicious, but their trees don't grow in the same field.