Some of them have been mentioned before, but I'll play.
I have yet to get into the custom market, but I have found a couple of production folders that I feel are exceptional.
The Benchmade Mini-Grip, in all it's flavors. Consistent quality, excellent ergonomics, and a variety of options to make it your own. Benchmade even allows you to customize one on their website.
The Kershaw Cryo II. All steel construction makes it feel very stout for it's size, comfortable to use, and Kershaw pays attention to the heat treat, getting the best out of that 8cCrMov-whatever it is steel.
Boker Nano. Funky, chunky, stout style, the Nano is my choice when I don't want to scare non-knife people. Fit and finish on mine is excellent, with even gaps around all the screws, and that signature Curtiss pocket clip. Which holds the knife securely without shredding my pockets.
CRKT Ripple. One of the least expensive ways to get the IKBS, the Ripple comes in several colors and sizes, making it easy to get a flipper.
Cold Steel's goofy marketing belies the quality of their products. I have a Micro-Recon, and a Mini-Recon, and both feel quite sturdy, even with plastic handles. The Triad Lock makes it possible to forgive them for stabbing sides of beef and all the other antics.