What? No one has suggested an Extreme Ratio?
I have several dressy knives, including a Benchmade 530 and the Gold Class 531 just released. I like them. But, there are other options.
For example, the CRKT Ripple. I have one in the ultramarine blue and one in the bronze. Both are gorgeous knives, small-ish, lightweight, slim, and yet very sharp.
Possibly my dressiest knife is my mammoth ivory Mnandi. Sweet little knife and gorgeous to boot.
The Benchmade 940-1 is a very light knife, too, at 2.44 oz, nominally. The S90V blade is just a bonus.
Slightly heavier, the Kershaw Leek comes in a wide variety of colors and finishes. I have three. One is a damascus blade, one is a composite blade, and the third is the blackwashed composite blade. It comes in every color of the rainbow, including a rainbow anodize. Sweet little knife.
One you don't see much is a Spyderco Centofante Memory, anodized a beautiful light blue, quite sleek.
The Spyderco Dragonfly is another sweet little knife. I don't have one, but I have given one to my girlfriend (suitably engraved), the Tattoo. I like it, personally, and it's wicked sharp.
Maybe at the edge of the gent's knfe category is the Delica. I like that knife and have a couple. It's my girlfriend's basic carry knife. You can find sprint runs in titanium or in jigged bone (she has both). Perfect knife, the Delica. Everything you need in a knife and nothing you don't. Sprint runs of awesome steels are also available, as are colors, depending on your tastes.
Maybe an oddball choice here, but I've just gotten a Benchmade Bone Collector, a D2 blade with a walnut handle. The walnut really makes this sweet.