From the serviceable to the luxurious, Faber-Castell offers a great range of mechanical pencils. There are basic office-use pencils - great value, but should still stand up to years of use. There are more technical-style pencils, for those who love their mechanical pencils, still great value. And there are pencils to match their fine writing instruments.
The oddity of the range here is the e-motion - it's part of the e-motion range, with matching fountain pen, ballpoint and rollerball. But the pencil is something you don't see much of these days - a continuous twist mechanism pushes or pulls the thick 1.4mm lead, so you can have exactly the amount you want showing.