Those look like reasonable choices for 3x. Just be aware that BNC has pretty much consistently underperformed Bitcoin for it's entire history.
If that pattern keeps up, you might reach 3x sooner by holding BTC than BNC... just a thought.
One coin worth taking a good look at, is Spectrecoin (XSPEC). Given its robust privacy tech, groundbreaking features, strong dev team and a low market cap of less than 21 million coins, and its still cheap price less than $2 per coin, this one is a shoo-in for an easy 3x.
https://coinmarketcap.com/currencies/spectrecoin/If you are at all looking for a coin to HODL longer term, I urge you to research XSPEC's long term viability for yourself, by digging deeper into its technology, use case as a top privacy/anonymity coin, and ambitious roadmap. This coin is destined to be among the top two or three privacy coins in existence, so its longer term potential is FAR greater than 3x. You can start here:
http://coinwiki.info/en/SpectreCoinLow market cap, decent price, dedicated community, active devs.
Probably right.
This one will at least go 3x