Out of those two, the P6000 will do a better job of photos. But you'll really miss the extra light black of the P7000, or the six extra inks of the Z3200.
Personally, I'd just save a bit more money and get a real photo printer that will actually do the job properly, rather than spend a still-substantial sum now and get one that will likely disappoint when you try to push it into doing something it wasn't designed to do.