Re: Real cost of printing
What I would do is go to HP.com and choose an inkjet printer, and a laserjet printer. Then plug the numbers in. They have the prices and estimates of their cartridges on their site, at least they did last time I checked. That should work if you plug it in to the formula you provided earlier.
Desktop: Dell Dimension E510, 2.5GB RAM, Intel P4 3.0GHZ, 250GB HDD, Windows Vista Premium. Might not be the best, but the old girl is still running good.