I've got a HP Photosmart B110. Not as pretty as yours, though.

Cartridges last about 6-8 months and cost around $30. I can wear that.

That's for double-size black. I normally only use it to print C&S labels, so I don't use colour at all.

For anybody who doesn't know - make sure you set your defaults in your computer's print manager to 'black ink only', otherwise it (mine, at least) will rip your colour cartridges. Apparently 'black only' doesn't give as good a black as mixing colours into it. Work that out, if you can.