I've been admiring photos of the GEC Houndtooth, and went to pull the trigger on one, but the coffee house acrylic half whitt caught my eye. Two blades, single spring. Looks thin enough to disappear but robust enough to do whatever I need it to. So while I wait for it to arrive to see if I made the right decision, I was wondering what everyone else's favorite two blade, single spring knife might be? I'm avoiding the term "pen knife" because even though it may technically be one, I do not consider my 68 white owl to be a pen knife...