(I'll sound like a 1Password fanboy in this thread but so be it)

I'm not sure that's what you mean by "beware the clipboard", but 1Password actually clears the clipboard some time after you copy a password to it. In my case, it doesn't really help since I'm also using a clipboard history through Quicksilver…

As for the passphrase, this can be a problem. I was planning on regularly sending my list of password to my close family but never got to it yet.