[jacquesm]

Oh, as for laptop: I ended up buying a second hand W540 which is pretty beefy when you want it to be but normally it sips power (about 29 watts continuous draw, the screen is off because I have two external monitors connected). Oh, and about those monitors: I've reduced the backlight intensity from the default quite a bit and that made a real difference as well (besides the usual power saving and desktop lock settings).