Spyderco Calypso Jr. My friend gave me a budget to pick her out an EDC knife for up to $100. I looked and looked and thought about all of the knives that I've owned, and I could not in good conscious recommend anything better (considering the price) than a $40 Calypso Jr.
It has great blade steel, the best ergonomics on a small knife I've experienced. Beautiful balance, a very useful and versatile blade shape, great feel in the pocket...unscratchable scales and NO bladeplay.
It also opens very smoothly (for a lockback) and is backed by a terrific warranty.
I would recommend it to anyone looking to get into nice knives. It does everything I need a folder to do, and it does it all extremely well.
Nitin