I basically have the same thoughts, if the OP was looking for something like 10x or more profits then I would recommend that he took the time to look for altcoins with good reputation and a lot of potential to invest in them, but since he wants lower profits than that and he seems to be willing to wait until we are close to the next bull run then it makes sense that he invest in bitcoin alone, this way he will obtain his profits while at the same time he simplifies the process and he only has to worry about one coin instead of three.