My office is using an HP printer and we found the cartridges to be decently priced. Practically have a look on http://www8.hp.com/uk/en/products/printers/gateway-index.html and take your pick according to your needs.
Rodbam, what can you tell me about non-OEM ink? I own one of the HP Photosmart printers as well (specs here: http://www8.hp.com/uk/en/products/printers/gateway-index.html), and I would like to reduce my printing costs as much as possible.
I am no expert in this, but i had cartridges ruined after 3 refills with generic ink (and by that I mean not specifically designed for certain models). I have one of the HP multifunction printers, which fortunately did not get damaged in the process, but i certainly did not enjoy having to buy...