If I hadn't been really disciplined I'd have five by now, but I moved DH's granny's Singer 15 onto a charity and I've resisted taking on my late godmother's Janome on the grounds that it's totally seized, having never been used since the day her sister (died 1988) bought it for her.
So now I have my turn-of-the-millennium Brother electronic and my own mum's 1978 Singer 522, which I keep because its straight stitching knocks spots off the Brother, although the Brother does good automatic buttonholes and a wider range of utility stitches. Those two and my overlocker - no more room at the inn!
Don't ask me about the fabric stash, though....