Before you answer, please consider that, while the new Amiga systems being released are somewhat removed from the classics, they are not as far removed as the current Mac machines are from the classic Mac machines (and I don't think anyone is complaining that the latest Mac is not really a Mac -- On second thought, I guess someone is always complaining).
Anyway, please give it some thought. I'm still struggling with this question myself, though I have not yet lost sleep over it. There's probably no right or wrong answer, which makes me somewhat uncomfortable too.
It's obviously going to be a different answer for everyone, but for me personally I think the only Amiga's were the ones made by Commodore (including those models (re)released by Escom).
Anything else to me personally is not really an 'Amiga'.