Love love love me a Graphgear 1000, I keep buying them so I can have one in every car, one in every desk, one in workbench, one in my pockets - bought three for my daughter for Christmas so she'd quit borrowing mine.

Protip: The pencil has a long enough moment arm to snap 0.5 mm lead easily - 0.7mm diamond lead is WAY stronger than 0.5mm.