My BTC will only be limited to BTC/USD pair.

For altcoins, sh*t or not, I do have separate funds for that only limited to altcoin trading. This is to ensure that my strategy will not be affected by some of the given circumstances on either BTC or alts.

In terms of choosing altcoins, no doubt the technology behind it isn't really the main reason why people preferred this or that to trade. Volume-wise and popularity are the main criteria*. I do have my own list on my portfolio but decided not to share with it as lurkers might be confused about what to choose especially, newbies. They will think that just because those coins give profit to others, they will expect to have the same result.