Thanks for the advice, but kind of too late - I've just finished installing my sexy new HP Photosmart 2575 All-in-One (http://h10010.www1.hp.com/wwpc/uk/en/ho/WF05a/5043-5527-7369133-7369133-7369155-12209612.html)! (I wasn't joking when I said I needed one urgently!) It's ace, though, and pretty much fits with your advice - it does have a separate black cartridge, and I think the risk of the extra bits going wrong is worth how much use I'll get out of them - especially the copier.

I got five years out of my last printer, and that was a crummy old Epson, so I'm reasonably hopeful about getting a decent amount of service out of this one.